Which expression represents the sum of 21 and an unknown number?
a. 21-d
b. 21+d
c. 21÷d
d.21d

Find the values of the variables in the kite

The coordinate grid shows a pentagon. the pentagon is translated 3 units to the right and 5 units up to create a new pentagon. what is the rule for the location of the new pentagon?

Determine the area of a triangle with (see picture below)