At a particular restaurant, each pizza roll has 60 calories and each mini hotdog has 70
calories. A combination meal with pizza rolls and mini hotdogs has a total of 21 pizza
rolls and mini hotdogs altogether and contains 1380 calories. Determine the number
of pizza rolls in the combination meal and the number of mini hotdogs in the
combination meal.

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.