Can someone help me with this geometry question pls???

i think it's A.) 5.5

Step-by-step explanation:

A right triangle has 90°

Given: 15 and 20

15 + 20 = 35

90 - 35 = 55

55 is the missing angle

Round to the nearest tenth: 55 ÷ 10 = 5.5

1.1 * 10 ^ -3

Step-by-step explanation:

Given the value of the thivkness of a dollar bill to be 0.0011metre

The standard scientific notation is expressed as A * 10^n

A is any value between 1 and 10 where n is any integer

0.0011 = 11/10000

0.0011 = 11 *1/1000

0.0011 = 11 * 0.0001

0.0011 = 1.1 * 0.001

0.011 = 1.1 * 10 ^ -3 (Note that the decimal point is shifted forward three times and the power is negative because the value is less than 1)