Solve system of linear equations by substitution - 2x+9y=15

x+7=4

The wait time of a line t hours after a store opens is given by the expression. 40x-12x+23 What does the value 23 represent? A. the total number of people in line B. the rate at which people join the line C.

The angles in a triangle are in the ratio 2:3:4. Find the size of the smallest angle.

At is the solution to the equation? 8x + 4 = - 20

What is 1,562 divided. By 34

Before school, Janine spends 1/10 hour making her bed, 1/5 hour getting dress, and 1/2 hour eating breakfast. What fraction of an hour does she spend doing these activities?

3 to the power of 1170

how would you rewrite this expression with parentheses to equal the given value: 5+3*2-6. you have to make it equal 10.

Simplify the algebraic expression: 15xy - 13 + 4x + 3y + xy + 21

At 3:00 ok a truck and a car leave the same intersection traveling in the same direction. The truck is traveling at 43 mph and the car is traveling at 58 mph. At what time will they be 12 mi apart?

Express the recurring decimal 0.56 as a fraction in its simplest form