B. Write an algebraic expression for each of the following English phrases.


1. The difference between eighteen and a number m.
2. The sum of forty-five and a number r.
3. A number y squared plus twice the same number minus seventy-four.
4. One-half of a number c is subtracted from nineteen.
5. The product of a number n and six divided by thirty-one.
6. The perimeter (P) of a rectangle is twice the sum of the length (L) and
width (W).
7. The area (A) of a rectangle is the product of length (L) and width (W).
8. The perimeter (P) of a square is four times its side (S)
9. The circumference c of a circle is twice the product of II and radius (r).
10. The area (A) of a trapezoid is half the sum of the bases (A and b) or the
sum of the bases (a and b) divided by 2.​