For each expression, use a property to write an equivalent expression. tell which property you used. 10: cd= 11: x+13= 12: 4(2x-3)= 13: 2+(a+b)= 14: draw algebra time models to prove that 4+8x and 4(2x+1) are equivalent.

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

What is the value of the product (3-2i)(3+2i)?