What is the distance across the lake?
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you have to use the formula

Step-by-step explanation:

length times with time height

x = 15.008

Step-by-step explanation:

9^2 + x^2 = 17.5^2

x^2=225.25

x = 15.008

or

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