What is the value of x for the following system of equations?

15x-12y=13

30x+9y=4

Akiko wants to design the first section of a roller coaster track Akiko wants the ramp section to rise at 45 degrees with the horizontal. If the length of the ramp is 27 yards, find the height of the first section of the roller coaster, in yards.

What is the area of a square if one side is 40 inches long? Answer next to this = > in²

Two cars start from the same place at the same time but travel in opposite directions. One car averages 42 miles per hour and the other averages 51 miles per hour. In how many hours will they be 651 miles apart

Find the next three terms in the sequence 80 - 160 320 - 640

What's 48 minus 20 percent

How many solutions does the equation have? |p - 4| = - 5

F (x) = 2/3x+3, what is the value of f (12)

A problem on a multiple-choice quiz is answered correctly with probability 0.9 if a student is prepared. an unprepared student guesses between 4 possible answers, so the probability of choosing the right answer is 1/4.

The sum of two numbers is 47 and the difference is 9 what are the numbers?

List two properties of the polygon in the grid