Sheldon cuts a circle with a diameter of 14 centimeters from a square piece of felt 15 inches on each side. in terms of pi, how much felt is left over?
show work

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.

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.