In a class of 20 students, 40% are boys. Twenty-five percent of the boys and 50% of the girls wear glasses. How many students in the class wear glasses?

A wire that is 50 ft long needs to be divided into lengths using the ratio 2 to 3. What is the longer lengths?

A circle has a circumference of 18. It has an arc of 6. What is the central angle of the arc, in degrees?

Find the volume of a cube when it's side measures 2 cm.

6x + 4x - 1 = 2 (5x+4)

What is 25 ties 3 divited by 19

A. Slope is 3.5, and (-3, 2) is on the line.

By how many is 6 less than 14

In order for a film camera with a lens of fixed focal length F to focus on an object located a distance x from the lens, the film must be placed a distance y behind the lens. F, y, and x are related as follows: 1/F=1/X + 1/Y.

I am a number between 20 and 30. I am not divisible by 6. and the sum of my factors is 31. What number am I?

3 divided by 579 and show the work