John likes to watch the birds in her yard. One morning, she noticed that there are twice as many Robbins as Blue Jays. She counted 21 Blue Jays and Robin in all, how many Blue Jays did she count?

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