A group of students take a test. The group consists of 12 boys and 8 girls.

The mean mark for the boys is 18

The mean mark for the girls is 16.5

Calculate the mean mark for the whole group.

For an Ohmic conductor, tripling the voltage without changing the resistance will cause the current to A. decrease by a factor of 3. B. increase by a factor of 3. C. increase by a factor of 9. D. decrease by a factor of 9.

How many times does 3 go in to 83

What is the standard form for 9.4/10^2

4 (x-2) = 3 (2y-1) in standard form

A ball is dropped from the top of a building. The distance in feet above the ground, represented by h (t), after t seconds can be modeled by the equation h (t) = -16t^2+180. What is it's height after 3 seconds of falling?

5.815 in mixed number

An infant is 32.625 inches (in) long. Write this as a common fraction.

Is the dilation of - 3/4 a contraction or an expansion?

Complete the square x^2+2x-7=17 A) x=-1, x=3 B) x=5, x=-4 C) x=-1, x=4 D) x=-6, x=4

There are 5,280 feet in one mile how many feet are in 143 miles?