One of the steps rob used to solve an equation is shown below.

-5(3x + 7) = 10

-15x + -35 = 10

a: rob added -5 and 3x to eliminate the parentheses. this procedure is justified by the associative property.

b: rob added -5 and 3x to eliminate the parentheses. this procedure is justified by the distributive property.

c: rob multiplied 3x and 7 by -5 to eliminate the parentheses. this procedure is justified by the associative property.

d: rob multiplied 3x and 7 by -5 to eliminate the parentheses. this procedure is justified by the distributive property.

D

Step-by-step explanation:

Let's review the distributive property.

It is

a(b+c) = ab + ac

Whenever we have a sum/difference multiplied by a number upfront, we need to eliminate the parenthesis. We do it by multiplying the constant with the terms of the sum/difference inside the parenthesis, each respectively.

Looking at 2 steps, we see Rob:

From the answer choices, D is right.

cant open file sorry!

step-by-step explanation:

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.