Okay so first you want to simplify the given equation (7x+3y)(7x-3y)
in order to do this you multiply the first number of the first equation (7x) with the first number of the second equation (7x) this gives you 49x^2
Now you want to multiply the second number of the first equation (3y) by the second number of the second equation (-3y) this gives you -9y^2
Its as easy as pie!
The correct answer is C) 71
Answer:

Step-by-step explanation:
The volume of a box is equal to the length l times the width w times the height h.

Substitute the values of the length l=8, the width w=2, and the height h=4 into the formula.

Multiply 8 by 2.

Multiply 16 by 4.

Hence, the volume of the rectangle prism is 64(in)³.
Thank you for letting me help :)