Which equation means seven times a number is equal to 21?
a. 21 7 = n
b. 7 × 21 = n
c. 7 n = 21
d. 7 × n = 21

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Why is studying fractions important