How do I solve the system of equations using substitution

Suppose the consumption of electricity grows at 9.5% per year, compounded continuously. Find the number of years before the use of electricity has tripled. Round the answer to the nearest hundredth?

A rectangular prism has a length of 20 in., a width of 2 in., and a height of 314 in. The prism is filled with cubes that have edge lengths of 14 in. How many cubes are needed to fill the rectangular prism? Enter your answer in the box.

The area of a carpet is 36x - 12 square inches. If the width of the carpet is 3x - 1 inches, what is the length?

A local ice cream store is analyzing the day's sales. Each serving came in either a cup or cone, but not both, and the ratio of servings to cups was 7:4. What was the ratio of serving to cones? A) 4:7 B) 3:4 C) 7:3 D) 11:4

How do I solve this? 4x^2-2x (x-2y) + 2y (2y+x) - 2x^2

Convert 3/4 into a quotient and percentage

Simplify the expression 3 (-3y+2x) combine like terms a+3a-b+4b+c

If a figure has 5 sides 5 vertices and no equal sides what is it? it is a polygon BTW

If I rent a boat for $25 per hour and a charge additionally $12 for fuel is the number of hours I rent the boat proportional to the total cost

90,88,88,87,84,95,90,80,98, and 100 (A) find the mean of these numbers (B) find the median of these numbers