There are 25 students in a class. 2/5 of them walk to school. which method is a way to find the number of students who walk to school?
divide 25 by 5 and then multiply the quotient by 2.
multiply 25 by 5 and then multiply that product by 2.
multiply 1/25 by 2/5.
multiply 25 and 5/2.

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Afurniture manufacturer produces chairs and sofas. each chair requires 10 yards of fabric, and each sofa requires 20 yards of fabric. the manufacturer has 300 yards of fabric available. to fulfill orders, the number of sofas must be at least twice the number of chairs. let x be the number of chairs and y the number of sofas. which inequalities are described in the problem? check all of the boxes that apply

What is the difference between regular convex and concave polygons