+1982 The area of a circle is approximately 3.14 times the radius squared. Which of the following expressions is a correct way to write this, if the radius is x?
A. (3.14x)^2
B. 2(3.14)x
C. 3.14x^2
D. x(3.14)^2
Translate the difference of five squared and n into symbols.
A. 5^2 ÷ n
B. 5^2x n
C. 5^2- n
D. 5^2+ n
Merrill bought m notebooks for $2.50 each and n pens for $1.25 each. Which expression best shows how much she spent?
A. 2.50m + 1.25n
B. 3.75(m + n)
C. 2.50 + m + 1.25 + n
D. mn + (2.50)(1.25)
+220 1. C, you are only squaring the x and multiplying it by 3.14, not anything else
2. C, to find the difference of two things, you subtract one from the other
3. A, you are buying m notebooks and each is 2.50, so the total is 2.50m and the same goes for the pens but n and 1.25 instead.
+220 1. C, you are only squaring the x and multiplying it by 3.14, not anything else
2. C, to find the difference of two things, you subtract one from the other
3. A, you are buying m notebooks and each is 2.50, so the total is 2.50m and the same goes for the pens but n and 1.25 instead.
