In how many different ways can a true-false test consisting of 10 questions be answered?

What is the exact volume of the cylinder 1.5 m 2.5 m

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

Is the square root of 4 plus the square root of 16 rational?