In a group of 60 secondary school science teachers. 30 teaches biology, 27 teaches Physics and 21 teaches Chemistry, 12 teaches both Biology and Physics but none teaches both biology and Chemistry. How many teaches Chemistry and Physics and how many teaches only Physics. ​

Pick the description of a geometric object that best matches the real world object box for a deck of card

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.

The perimeter of a rectangle is greater than or equal to 74 meters. if the length is 25 meters, the minimum width of the rectangle is meters.