Select the correct answer.
What is the justification for step 3 in the solution process?

10d − 5 = 4d − 15 − 3d
Step 1: 10d − 5 = d − 15
Step 2: 9d − 5 = -15
Step 3: 9d = -10

How many solutions does the nonlinear system of equations graphed below have?

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

Use the distance formula to find the distance between (-3,5) and (3,1)