What are the ways to determine if a relation is a function

7. The value of y varies directly with x, and y = 8 when x = 2. Find y when x = 10.

Simplify and combine terms 9x+6-4x-2x+1-15

Evaluate 48 + 24 : 8 - 22. 47 51 55 64

If the area (in square units) of the region under the curve of the function f (x) = 4 on the interval [1, a] is 20 square units, and a > 1, then what is the value of a? Answers to choose from is: a) 5, b) 6, c) 8, d) 9.

Sam ate a total of 13 hotdogs. He ate 2 hotdogs every 4 minutes. How many minutes did it take for Sam to finish all 13 hotdogs?

Factor completely x^2-10x+25

Which describes the pedestrian crossing sign shown? The sign is a trapezoid because exactly one pair of opposite sides is parallel.

Which is greater 5 pounds or 85 ounces

2x+5y=20 in slope intercept form

There are 550 students at Green County Middle School and 220 of them ride the bus to school. What percent of the students ride the bus?