Given the expression 12c7, which of the following scenarios could this combination represent? a. selecting 5 out of 23 students to give a presentation during class today b. selecting 7 out of 12 students to compete at an art fair c. the order in which the first 7 runners of a race finish d. arranging 7 students in 12 chairs

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

Two lines parallel to the same plane are parallel to eachother

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.