This maybe primary but i don't get it

There's a circle with the radius = 3, calculate it's perimeter

Event tickets cost $20 each. A student ordered some tickets online. There was a service charge of $2.50 per ticket. The total cost was $540. (A) Write a function rule for the cost of number of tickets. (B) How many tickets did the student order?

You have Five Dragons and you add Ten and divided Five. How many Left?

Ted earns 13 dollars an hour at a theater Last week he worked h hours at the concession stand and 3 times as many hours at the ticket stand Write and simplify an expression for the amount he earned last week.

What is the area of a 45 degree sector of a circle with a radius of 12in.? Use 3.14 and round the answer to the nearest square inch.

Lucy's fish tank has 14 liters of water in it. She plans to add 5 liters per minute until the tank has at least 49 liters. What are the possible numbers of minutes Lucy could add water? Use i for the number of minutes.

May can swim one lap in 6.089 seconds, and Sarah can swim one lap in 6.098 seconds. Write an equation to compare their speeds.

How do I solve systems of equations using elimination?

Which of the following is a polynomial with roots 2, 3i, and - 3i? A. f (x) = x^3 - 2x^2 + 6x - 9 B. f (x) = x^3 - 6x ^2 + 9x - 18 C. f (x) = x^3 - 6x^2 + 18x - 2 D. f (x) = x^3 + 2x^2 + 9x - 18

The surface area "S" of a cube with side length e is S = 6e^2. Find the side length of a cube with a surface area of 150 cm.

A farmer hears a weather report saying that temperatures will be decreasing approximately 6∘ 6∘ every hour for the next 5 hours. What signed number represents the total change in temperature expected over the next 5 hours