Which equation could be used to solve problems involving the relationships between the angles?

A) (12 + a) + (7a + 12) = 90

B) 90 + (12 + a) = (7a + 12)

C) (12 + a) - (7a + 12) = 90

D) (7a + 12) - 90 = (12 + a)

6x - 2y = - 16 4x + y = 1

Jalen spent $21.60 of the $80 he got for his birthday what percent of his money did he spend?

When adding two negative integers, how do you determine whether the answer will be positive or negative?

A guitar string vibrates back and forth 88 times in 1 minute. what is its period in seconds?

Suppose j and k vary inversely, and k=3 when j=12. Find k when j=18. 2 4 24 36

Are q/3 and 1/3q equivalent?

Mrs. Moore's class is conducting an experiment to find the probability of pulling certain colors from a bag of 25 marbles.

Find the LCM of the numbers using lists of multiples. 1: 4,14 2: 6,20 3: 12,28

What is Factor tree of 495?

Lynda is flying her kite at the end of a 40m string. The string makes and angle of pie/4 with the ground. The wind speed increases and the kite flies higher until the string makes an angle of pie/3 with the ground.