How many minutes did mike and erica spend on the computer if mike spent 1/2 a minute and erica spent 1.5 minutes

In trapezoid klmn, kj=19.2 and jm=22.5. identify ln.

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.

How to solve a simultaneous equation involved with fractions?