The cost of a pencil is 25 cents more than the cost of an eraser. if the cost of 8 pencils is 0.80 more than the cost of 10 erasers, find the cost of each.

For this case we propose a system of equations:

x: Let the variable representing the cost of a pencil

y: Let the variable representing the cost of an eraser

We substitute the first equation in the second one:

Thus, the cost of an eraser is 99.6 cents.

On the other hand:

Thus, the cost of a pencil is 124.6 cents.

The cost of an eraser is 99.6 cents.

The cost of a pencil is 124.6 cents.

the ratio of white tiles to blue tiles is 48: 16. the ratio in it's simplest form is 3: 1.

step-by-step explanation:

ratio: take the first number and add a colon next to it, then add the second number after that. make sure the ratio order matches up with the written problem!

simplest form: we can simplify the ratio 48 : 16 by dividing both terms by the greatest common factor (gcf).

the gcf of 48 and 16 is 16.

divide both terms by 16:

48 ÷ 16 = 3

16 ÷ 16 = 1

reducing to simplest form:

48 : 16 = 3 : 1

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.