How do you show 2+3i is a root of x^2-4x+13

A cylindrical water tank is being filled with a hose. The depth of the water increases by 1 1/4 feet per hour. How many hours will it take for the water level in the tank to be 3 1/2 feet deep?

Three years ago, Sherman was twice as old as Clive. If Clive's present age is c, which expression represents Sherman's present age in terms of Clive's age? A. 2c - 3 B. 2c + 6 C. 2 (c - 3) D. 2c + 3

What type of line is the graph of x = - 2?

Laura has $30 to spend on food for the week. Which inequality represents this? x <30 x 30 x> 30

Solve for x: - 4 + x > 5

Carl has three lengths of cable, 5 _ 6 yard long, 1 _ 4 yard long, and 2 _ 3 yard long. He needs at least 1 yard of cable.

What is the answer to 3x+5/x-3

7. Manny charges $1.25 for a cup of Temonade at the lemonade stand. He sells 9 cups. How much money does Manny collect?

If the ratio of children to adults is 7:8 and there are 140 children at an amateur surfing competition, how many adults are in attendance?

7 birds are on a fence, half of them fly away, then 2 come back. How many birds are left on the fence?