Use the substitution method to solve the system of equations. Then check your solution.

1.) b=-4a+5

a-b=5

2.) 6x-y=-15

x+2y=17

3.) x=10

y=2x-6

4.) n=-7m-4

14m+2n=-8

Melvin is making a large poster for the school carnival. he skeched his design on a 9 inch by 12 inch sheet of paper then he expanded his design by a scale of 3 what are the dimensions of the poster. What is the area of the poster

Going against the current, a boat takes 6 hours to make a 120-mile trip. When the boat travels with the current on the return trip, it takes 5 hours. What is the rate of the boat in still water? 2 mph 20 mph 22 mph

A car can travel 60 miles on 3 gallons of gasoline. How far can it travel on 11 gallons of gasoline?

Whats the standard deviation of 1,5,7,3,2,9,1

A rental company charges $50 plus $0.20/mi to rent a car. Marissa must spend under $184.60 on the rental. How many miles can Marissa drive the car?

What is polynomial 10x3 + 35x2 - 4x - 14 is factored by grouping.

Danny gets paid $8 per hour. What is the rate of change? A) m=4 B) m = 1/2 C) m=8

Two equivalent expressions the are equal to (9-c) + (9-c) + (9-c) + (9-c) is

If two angles in a triangle add up to138, then what is the size of the third angle

Kay has an 80% probability of making a free throw in basketball and each free-throw is independent. Kay gets to take two free throws and must make both to win the game. What is the probability that Kay's team will win the game?