Mathematics College

## Answers

**Answer 1**

**Step-by-step explanation:**

let age of Byron be b yr old and Cindy be c yr old.

c = b + 2 --(1)

b - 8 + c - 8 = 14

b + c = 30 --(2)

sub (1) into (2):

2b = 28

b = 14

therefore Byron is 14 yr old now.

Topic: simultaneous eqns

If you like to venture further, do check out my insta (learntionary) where I regularly post useful math tips! Thank you!

**Answer 2**

**Answer:**

10

**Step-by-step explanation:**

Byron is 2 yrs younger than Cindy. 8 years ago the sum of their ages was 14.

Byron is 2 years at that time. Definitely, Cindy is 12 years old so the sum of their ages was 14. Let us just add 8 years to Byron's age at that time so 2 + 8 = 10

P.S: This just based on my understanding of the problem.

## Related Questions

How can you use counters to show division and subtraction

relationship

### Answers

**Answer:**

what grade are u in just need to know so I can help bc I dont understand the question

If the coordinate ( -12, 15 ) was translated according to (x+3, y-2), what would the new coordinate be?

### Answers

(-9,13) hope this helps

Solve for x. Show your Work.

### Answers

**Answer:**

**50+3x+4 = 90**

**54+3x = 90**

**3x = 90-54**

**3x = 36**

**x = 12**

**3x+4 = 3(12)+4**

** = 36+4**

** = 40**

please help me write the expressions I'm terrible at word problems!!

### Answers

**Answer:**

Expression: 2.89+(1.28x3) Answer: 6.73

**Step-by-step explanation:**

Number 1

How many pounds of chocolates that cost $7 per pound must be mixed with 3 pounds of caramels that cost $3.50 per pound to make a candy mix that

cost $5.25 per pound?

### Answers

**Answer:**

You know somw things are changed i can't even answer that so please answer it yourself because hahhahaahahaahahhahahahha hello

**Step-by-step explanation:**

Because i dont know how to answer that ok?! Tell that to ur mom haha

how many times greateri is the value of the digit 9 in 90,000 than the value of the digit 9 in 9,000

### Answers

**Answer:**

It is 10 times greater.

**Step-by-step explanation:**

The place value of 9 in 90,000 is in the 10,000th place.

The place value of 9 in 9,000 is in the 1,000th place.

10,000 divided by 1,000 = 10.

In conclusion, the place value of 9 in 90,000 is 10 times greater than the palce value of 9 in 9,000.

Missy wants to find the surface area of a snack box in her pantry her work is shown below

### Answers

**Answer:**

Step 2: Missy did not multiply the area of each face by 2 before adding.

**Step-by-step explanation:**

I took the test :)

Brainliest be good peeps Calculate the missing term in each and for 2 its not 6/7 it cant be okay? thanks tho if you try and get that.

proportion.

2/11= /55

36/42= /

9/ = 21/28

6/9= /15

### Answers

**Answer:**

**Step-by-step explanation:**

For 2 it is 6/7. 36 and 42 share a common factor, 6. If you divide each one by 6, 36 becomes 6, and 42 becomes 7. So, number 2 is 6/7.

Yes the person that answered were correct I had this question

15x + 10 - 6 PLEASE HELP ME SOLVE THIS PLEASE SHOW WORK TO? THANK YOU

### Answers

This is how you do it

Each square and figure DNE has a side length of one unit compare the area of the two figures which figure has more area how much more explain or show your reasoning

### Answers

Answer:

✅Figure E has more area

✅Figure E has 5.14 units² much more than Figure D.

Step-by-step explanation:

The logic to solving this kind of problem is to decompose and each of the figure to find out how many squares and circles are there in each figure, them calculate the area of each figure using the formula for area of square and area of a circle.

✍️Figure D:

Figure D is composed of 2 squares and 4 semicircles (2 full circles).

Since side length of 1 square = 1 unit, therefore, radius of the semi-circle/circle = 1 unit.

Area of the 2 squares = 2(s²) = 2(1²) = 2 unit²

Area of the 2 full circles = 2(πr²) = 2(3.14*1²) = 6.28 unit²

Area of Figure D = 2 + 6.28 = 8.28 unit²

✍️Figure E:

Figure E is composed of 4 squares and 6 quarter circles (3 full circles).

Area of the 4 squares = 4(s²) = 4(1²) = 4 unit²

Area of the 3 full circles = 3(πr²) = 3(3.14*1²) = 9.42 units²

Area of figure E = 4 + 9.42 = 13.42 unit²

✅Therefore, we can conclude that Figure E has more area.

✅Figure E has 5.14 unit² more area than Figure D (13.42 - 8.28 = 5.14).

Charlie bought a pair of shorts at the store when they were having a 45% off sale. If the regular price was 24$ how much did charlie pay?

### Answers

**Answer:**

$10.80

**Step-by-step explanation:**

45% of $24=10.8

use place value and money to make it $10.80

TEN DOLLARS AND EIGHTY CENTS

3+(-2)-(-3)-(5)+(-1)-(-7)=

### Answers

**Answer:**

-1

**Step-by-step explanation:**

did math on caculator

Can someone Please help with this problem,please help me ASAP !!!l

### Answers

**Answer:**

I'd say B bcs it's the only thing that would fit with the shift on x axis and y axis

Please help me with all thank you I’ll mark Brainly please number answers

### Answers

**Step-by-step explanation:**

...........................

Mr. Barnes hired a plumber to fix a leak. The total cost, in dollars, that the plumber charges for a job can be modeled by the function

p() = 45 +35x, where x represents the time, in hours, that the plumber used to complete the job.

Mr. Barnes budgeted $220 to pay the plumber for the job.

After how many hours will the cost of the job exceed Mr. Barnes's budget?

### Answers

**Answer:**

After 5 hours

**Step-by-step explanation:**

**Given**

[tex]p(x) = 45 + 35x[/tex]

**Required**

Determine what time the budget would exceed $220

**To do this, we simply substitute 220 for p(x)**

[tex]220 = 45 + 35x[/tex]

[tex]220 - 45 = 35x[/tex]

[tex]175= 35x[/tex]

**Solve for x**

[tex]x = 175/35[/tex]

[tex]x = 5[/tex]

**So, Mr. Barnes would exceed his budget after 5 hours**

A pair of shoes was $5 but is now on sale for

$4. What is the percent discount?

### Answers

**Answer:**

20%

**Step-by-step explanation:**

i actually dont know sorry :(

**Answer:**

20% discount

**Step-by-step explanation:**

4/5 = 80%

5/5 - 4/5 = 1/5

1/5 = 20%

Expressions equivalent to z+(z+6)

### Answers

**Answer:**

2z+6

**Step-by-step explanation:**

**Answer:**

z+ (z+6) =2 (z+3)

**Step-by-step explanation:**

the other given optional expressions are not equivalent to the given expression. The option 2 (z+3) is correct and it is the equivalent expression. Hence the given expression z+ (z+6) is equivalent to the expression 2 (z+3)

Matt received change totaling 1.85 in nickels,dimes, and quarters. He recieved at least one coin of each type. What is the least number of coins he could of recieved

### Answers

**Answer:**

6 quarters 2 dime 3 nickels

**Step-by-step explanation:**

1. Simplify by using the distributive property:

4 (2x +9)

### Answers

**Answer:**

8x+36

**Step-by-step explanation:**

Hi, let me help you out!

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

In order to simplify this, we should use the Distributive Property:

[tex]\longrightarrow\tt{a(b+c)=ab+ac}[/tex]

According to the property,

[tex]\longrightarrow\tt{4(2x+9)=8x+36}[/tex]

I hope it helps you! Have an awesome day!

If you need any explanation or clarification, feel free to reach out! :D

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The hours a week people spend answering and sending emails is normally distributed with a standard deviation of Ï = 150 minutes. How large of a sample size would you need to estimate the mean number of minutes people spend answering and sending emails with an error of 1 minutes with 99% confidence? What would be the practical problem with attempting to find this confidence interval?

### Answers

**Answer:**

sample size n would be **149305 **large

Value of n (**149305)** is **too high, **this will be the practical problem with attempting to find this confidence interval

**Step-by-step explanation:**

Given that;

standard deviation α = 150 min

confidence interval = 99%

since; p( -2.576 < z < 2.576) = 0.99

so z-value for 99% CI is 2.576

E = 1 minutes

Therefore

n = [(z × α) / E ]²

so we substitute

n = [(2.576 × 150) / 1 ]²

n = [ 386.4 ]²

n = 149304.96 ≈ **149305**

Therefore sample size would be **149305 **large

Value of n is **too high, **that would be the practical problem with attempting to find this confidence interval

Please I need help I give brainliest!!

### Answers

**Answer:**

x=x

**Step-by-step explanation:**

ATA movie theater the size of popcorn has decreased by 10%. If the old bag held 14 cups how much does the new bag hold

### Answers

I think

**Step-by-step explanation:**

12.5 since it decreases 10% and the old bag had 14 cups and 10% is 1.4

Tony and some friends went to the movies. They bought 4 drinks and 2 tubs of popcorn and spent a total of $32.50 on the food. Each drink costs $3.50 less than a tub of popcorn.

a. Define a variable. Write an equation that can be used to find the cost of one tub of popcorn.

b. Solve the equation to find the cost of a tub of popcorn.

### Answers

Your answer would be B

$1.00 to 2/3 gallon

2

10 points

A caterer needs to buy 21 pounds of pasta to cater a wedding. At a local store, 8 pounds of pasta cost $12. How much is the cost per

pound?

### Answers

**Answer:**

**$1.5/pound**

**Step-by-step explanation:**

Number of pounds = 8pounds

Cost of pasta = $12

Now;

Unknown:

cost per pound of pasta

**Solution: **

To find the cost per pound of pasta;

Cost per pound of pasta = [tex]\frac{cost of pasta}{number of pasta}[/tex]

Cost per pound of pasta = [tex]\frac{12}{8}[/tex] = **$1.5/pound**

a snail crawls 3/4 inches in 1/5 of a minute how long will it take the snail to crawl 1/2 in?

### Answers

**Answer:**

**15/4**

**Step-by-step explanation:**

Whenever you are working with a question of rate where two different quantities are being compared, the required units will indicate which quantity is to be divided by which.

3/4 divided by 1/5

3/4 times 5/1 (multiply reciprocal)

=15/4

I havent done this in a while so im not entirely sure.

HELP PLEASE IM LOOSING MY MIND

### Answers

**Answer:**

C is da answer

**Step-by-step explanation:**

**Answer:**

never seen such big horror

but I think it D using logic

Give two reasons why it's impossible to draw triangle PQR m angle Q=103^ m angle R=47^ p = 44 q = 12 , and f = 31

### Answers

**Answer:**

It is impossible becuase it would not eqaul the numbers a regular triangles would have. A triangle has to equal a certain number and this number does not make a traingle.

**Reason 1:** The hypotenuse is invalid, because 44^2 does not equal 12^2 + 31^2.

**Reason 2:** The angles measures do not correlate properly to their assigned letter sides (at least to me). Additionally, 30 degrees just doesn't make any sense from a logical standpoint.

Ivy wants to see 20 birds on her hike. So far, she has seen 8. How many more birds does she need to see.

### Answers

**Answer:**

12

**Step-by-step explanation:**

20-8=12

What is the slope?

Simplify your answer and write it as a proper fraction, improper fraction, or integer.

### Answers

the line goes through the points (1,2),(5,3) and (9,4)

so the rise is 1

the run is 4

so the slope (aka rise over run) is 1/4x

A store manager created this table representing the relationship between the reported number of snow days during a given month, x, and the sales revenue of bags of rock salt, y, rounded to the nearest dollar.

Using the linear best-fit model for the data, what is the predicted sales revenue of rock salt given there were 11 snow days in the month?

$773.00

$1,374.00

$1,457.00

$1,474.00

Number of snow days

Rock salt sales revenue

2 $823.00

1 $725.00

3 $943.00

5 $1,086.00

4 $997.00

3 $951.00

7 $1,163.00

6 $1,098.00

### Answers

**Answer:**

1374.00

**Step-by-step explanation:**

I just took the test

oh this is for k12 students by the way