Find the solution to each equation mentally or use your calculator. (Hint: do the opposite of the number on the left side of the equation) .

A: 30+a=40

B: 500+b=200

C: −1+c=−2

D: d+3,567=0

PLEASE ANSWER EACH ONE IM HAVING TROUBLE PLSSS HELP :( IM GONNA FAIL

Factor this polynomial completely x^2-64

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

1. a parachutist is 800 feet above the ground when she opens her parachute. she then falls at a constant rate of 5 feet per second. select the equation that represents this situation. h = -800t + 5 y = -5x + 800 h = 5t - 800 y = 800x + 5 i need