If the original quantity is 8 and the new quantity is 4, what is the percent decrease

its a half a percent or 50%

Step-by-step explanation:

50%

Step-by-step explanation:

First, to find a percentage, you divide the part out of the whole (numerator out of the denominator in a fraction);

4 ÷ 8 = 0.5

Once you have your decimal number, you need to move the decimal point 2 spaces to the left to turn it into a percentage;

0.5 = 50

Therefore, the percent decrease is 50%.

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