Angle a and angle b are complementary angles. The measure of ∠a is 42°.

Which equation represents this situation with x representing the measure of ∠b?

A. 90+x=42

B. 90+42=x

C. 42+x=90

D. 42-x=90

A set of equations is given below: Equation A: e = 4f + 1 Equation B: e = 3f + 5 Which of the following is a step that can be used to find the solution to the set of equations? how do you do this

12r + 5h - 7u + 11r + 9h - 4r

company buys a toy for $1.50 and marks it up 70%. Find the markup.

What is the first step in solving the equation x2 - 16 = 0? Add 16/25 to both sides. What is the second steppin solving the equation?

Gregory predicts that 310 people will attend the spring play. There was an actual of 220 people who attended the spring play. what is the percent error? Round to the nearest whole percent

Chrissy walked 1/8 of a mile on Monday and 1/8 of a mile on Tuesday. How many miles did Chrissy walk on Monday and Tuesday combined? Express the answer in lowest terms. 1/16 1/8 1/4 1/2

Which of the following values best approximates the length of c in triangle abc where c = 90 degrees, b = 12, b = 15 degrees

Four times a number, y, increased by eight

The average person's head has about 100,000 strands of hair What is that in scientific notation

Each day, Maya eats 1/5 cup of melons in the morning and 1/5 cup of melons in the afternoon. How many days will it take Maya to eat 8 cups of melons? A 19 B 20 C 18