Janey went to the library at 3:45 pm. and left at 7:45 pm. How long was she at the library?

4 hours

Step-by-step explanation:

4 hours

This will help you: https://1.cdn.edl.io/mA04MXIRc85TakQw0156ELS9yZAAVHhKVpKxPK85E7OSIdcy.pdf

answer: it's d

step-by-step explanation:

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