Determiner le nombre rationnel X dans chacun des cas suivants :
1/5+1/10+1/x=11/30

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

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: