Which element is always present in a combustion reaction?

A. nitrogen

B. hydrogen

C. oxygen

D. carbon

You return several shirts to a store. The receipt shows that the amount placed back on your credit card is - $30.60. Each shirt is - $6.12. How many shirts did you return?

If ln (a) = 2, ln (b) = 3, and ln (c) = 5, evaluate the following: ln (a^-4/b^1 c^1)

Ellen had 25 hair clips. 7 of them and the rest were purple, what precent of the hair clips were blue

How would you multiply a fracton 1/8 times 2/5

Evaluate the expression 3 (2-1) + 2 + - - 7 for x = 3 Step 1: What is the first step for evaluating this expression?

3. Which of the following is equivalent to 3 (y - 1 + 2y) ? A. 3y - 9 B. 6y - 3 C. 9y - 3 D. 3y - 3

If y various directly with x, write an equation for the direct variations. The find each value. 1.) If y = - 4 when x = 10, find y when x = 5 2.) If y = 12 When x = - 15, find y when x = 2 3.

89 (54x - 36) + 2 = - 3/4 (-40 + 16x) + 90xsolve for x

The ratio of cars to vans in a parking lot is 1 to 4. If there are 40 cars and vans in the parking lot altogether then how many vans are there?

Geoffrey's babysitter stayed from 6:25 P. M. until 10:40 P. M. For how much time does the babysitter need to be paid?