C = number of stamps collected by Callie Jenna and Callie collect stamps. Jenna has 20 less than twice the number of stamps that Callie has. Which expression represents the number of stamps that Jenna has?

look a the sides they are perpendicular

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet