Simplify the following: (-8z)^2
A. – 64z^ 2
B. 16z
c. 16z^2
D. 64z^2
E. –16z^2
Look at the picture pls ! I need help ..

Which of the following is the result of expanding

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project