Which of the following represents 645?

a. 6 hundreds + 5 ones
b. 3 hundreds + 34 tens + 5 ones
c. 5 hundreds + 4 tens + 5 ones
d. 6 hundreds + 2 tens + 15 ones

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

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).