Find the sum of the first twenty terms of an arithmetic progression

16+9+2 + (-5) + ...

How do i solve 2x + 9 = 12

Javier drove 45 miles. this represents 60% of his entire rode trip. what is the total number of miles in javier's trip?

Standard measures of volume are units A) square B) cubic C) rectangular D) linear

Dirk ordered a circular pizza that was 16 inches wide. If dirk ate a quarter of the pizza how many square inches of the pizza did he eat?

Which of these true conditional statements has a false converse? a) If 2x = 4, then x = 2. B) If a figure is a triangle, then the figure has three sides. C) If a figure is a square, then the figure has four sides.

Solve using substitution. 2x-3y x+y=9 just so you know, I know the answer its (3,6). I just need the explanation on how to get that answer using substitution.

A speed boat is traveling at 100 km/hr. How many hours will it take for the boat to cover a distance of 115 km?

A die contains the numbers 1 through 6. David rolls the die 2 times. What is the probability of getting a 3 on the first roll and a 5 on the second roll?

The equation y = 55x + 85 describes the amount of money a plumber charges, where y is the total amount he charges and x is the number of hours he works. The table shows the total amount of money an electrician charges.

The formula C = 2πr relates the radius r of a circle to its circumference C. Solve the formula for r.