The square of a number decreased by 15 is equal to twice the number. find the number

Aretha runs a marathon in 3.25 hours. Neal takes 1.6 times as long to run the same marathon. How many hours does it take Neal to run the marathon?

Jina needs to drive 12 miles to work. So far, she has driven 6.7 miles. How many more miles must she drive? miles x 5 ?

A survey determined that 7/18 of the seventh grade students at Mills Middle School preferred round chocolate candies to hard candy. When Jennifer duplicated the survey, 1/9 of the students changed their preference from chocolate candy to hard candy.

When simplifying the quadratic formula to solve the equation x 2 + 6x - 55 = 0, the number under the radical sign will be:

Bubba makes 7 1/2 sandwiches in 1/2 hours. What is the unit rate for sandwiches per hour?

Assume that your production line has a quota of 10 units per day at $25.00 per unit an your line meets its quota

The equation f = v at represents the final velocity of an object, f, with an initial velocity, v, and an acceleration rate, a, over time, t. Which is an equivalent equation solved for a?

Class 10R sat a test. The mean mark of the class was 70%. There are 30 students in class 10R, 20 of whom are boys. The mean mark for the boys in the test was 62%. Work out the mean mark for the girls.

What is $16.50 x 7%

3. "a varies directly with b". If a = 4 when b = 21, find a when b-7.