Toby wrote the following:

7 1/4 - 3 3/4 = 4 2/4 = 4 1/2

is toby’s calculation correct? draw a number line to support your answer.

Step-by-step explanation:

The given expression is

We can rewrite the expression as

When we subtract expressions on the left

While Toby's result after solving this is

Therefore, Toby has done a mistake in this step.

will be the answer.

i got 142 as my answer

step-by-step explanation:

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)