Can somebody please help me with this, I like actually don't know. Write this out as an algebraic expression
6 times the sum of r and 9

make sure to write "x" not as a variable

Step-by-step explanation:

6 x r + 9

6(r+9)

Step-by-step explanation:

A number outside of a parenthesis is the symbol for multiplication.. so..

6(

"Sum" is the vocabulary used for "the answer you get after adding"

so.. you have to add..

6(r+9)

and close the parenthesis of course.:)

step-by-step explanation:

m∠a is 90°

m∠b is 40°