Evaluate when a=4 and b=9: 5ab-b

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Is it true that product of 3 consecutive natural numbers is always divisible by 6? justifyyour answer

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers