Question

b. find the missing length of each side marked with ? in polygon b.
the missing values are 3 and 5.

c. determine the measure of each angle marked with ? in polygon a. 82° and 23°

1. complete each equation with a number that makes it true.

a. 8 • ______ = 40
b. 8 + ______ = 40
c. 21 ÷ ______ = 7
d. 21 − ______ = 7
e. 21 • ______ = 7

Explanation:

Part 4a

Step1: Let the missing number be \( x \). The equation is \( 8 \cdot x = 40 \). To find \( x \), we divide both sides by 8.

\( x=\frac{40}{8} \)

Step2: Simplify the division.

\( \frac{40}{8} = 5 \)

Step1: Let the missing number be \( y \). The equation is \( 8 + y = 40 \). To find \( y \), we subtract 8 from both sides.

\( y = 40 - 8 \)

Step2: Simplify the subtraction.

\( 40 - 8 = 32 \)

Step1: Let the missing number be \( z \). The equation is \( 21\div z = 7 \). To find \( z \), we can rewrite it as \( z=\frac{21}{7} \) (since \( \text{divisor}=\frac{\text{dividend}}{\text{quotient}} \)).

\( z=\frac{21}{7} \)

Step2: Simplify the division.

\( \frac{21}{7}=3 \)

Answer:

5

Part 4b