How can we tell if a number is divisible by 4?

a. the sum of the digits is 4

b. the sum of the digits is divisible by 4

c. the last digit is divisible by 4

d. the last two digits of the number are divisible by 4

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

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

Math i have no idea how to do a and b