If the gradient of a line C is 2/3 what is the gradient of the line which is perpendicular to C

What two numbers add to make twenty and have a difference of four?

Convert 21 / into a decimal

Chris sells encyclopedias and earns $45 for each set he sells. How many sets did he sell if he earned $540 last week?

3. A scuba diver is 15.5 feet below the surface of the water. If the diver continues to swim downward at a rate of 2.

A wire, 224 cm long, is cut into three pieces. The first is twice as long as the second. The third is 1/2 as long as the second. How long is the second piece?

Solve 2200 : 40 a. 55 b. 50 c. 60 d. 500

a farmer needs to buy fertilizer for his farmland. The instructions on the bag of fertilizer say 49.5 lb of fertilizer is needed for 1 acre of land. The farmers buys 2000 pounds of fertilizer.

6 Isabella paid a $50 initiation fee to the gym. Each month she pays $25. Write a linear equation that shows how much Isabella spent, y, at the gym in x months.

Which of the following two layers of Earth are part of the lithosphere?

Which best describes the solution to 4 minus 7?