Which of the following statements is NOT true regarding an expression written in scientific notation in the form of : a x 10n A. The value of 'a' must be greater than or equal to 1 and smaller than 10.
B. The value of 'n' must be an integer.
C. Doubling 'n' results in a doubling of the value of the expression.
D. Doubling 'a' results in a doubling of the value of the expression.

the correct answer is the second option

answer

you start with $5 and save $10 a week until you have at least $45wer

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