Louisa invested $16,000 in bonds paying 7% simple interest. How much additional money should she
invest at 4% simple interest so that the average
return on the two investments is 6%?

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3

Consider the function f(x)=-5x+3 what is f(-2)

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =