How to solve a problem using elimination when there are three equations?

What is 19-3x=21+x and how do i show my work

There are 9 students that play tennis. if 75% of the students do not play tennis, how many are in the class

Describe the number of imaginary solutions of a polynomial with a degree of 15 with exactly 3 real solutions.

Robin randomly selects a number between 1 and 20. What is the probability that the number selected is the square of a natural number? a. 1/2 b.-3/20 c.-3/10 d. 1/5 e. 1/3

Find the slope of the line whose equation is 17 + 3y = 7x.-7/317/3

Solve for f. 9f = 8f + 8 f

Explain how to write 50,000 using exponents. Answer can only be one number but the answer can have as much exponents as wanted

You and your friend are making 30 liters of sodium water. You have liters of 10% sodium and your friend has liters of 22% sodium. How many of your liters and how many of your friends liters should you mix to make 30 liters of 15% sodium?

The table shows the number of resident geese living in four different ponds. Which pond has the greatest population density of resident geese? Pond A Pond B Pond C Pond D

Is a home an asset or liability