Three-sevenths of a number is 21. find the number

The number is 49.

Step-by-step explanation:

Let the number be x

According to given condition:

3/7 x = 21

To find x, multiply both sides by 7/3

x = 21*7/3

x = 147/3

x = 49

I hope it will help you!

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