What is the simplified form of the expression 3²+7-y²-5-2y²-1

There are 11 students in our Science class left to give their presentations. Today we will have time for 6 presentations. How many different ways can the teacher choose the presenters?

How do you get the answer to 18,000 seconds = hrs?

What is 4x - (9-3x) = 8x-1

What are all the complex solutions for the equation x^2=4x-29

I had a summer job cooking two items at a bbq place. I sell burgers for $9.00 and sell chicken sandwiches for $11.25. Because I am a splendid cook, i sell a total of 330 items and make a total of $3,375. How many of each did I sell?

How to solve 2 (t+5/8) = 7 1/4

Joe and mike both ran the same race. Joe finish the race 4 minutes before mike. If mike finish the race at 4:02pm what time did joe finish the race

Can a triangle have two obtuse angles? Explain

Solve for r. r16≥8 r≥2 r≤2 r≥128 r≤128

Express your answer in the smaller unit 800m 35cm - 154 m 49 cm equals