1. A quantity is partly constant and partly varies inversely as the square of x.write the relationship between x and y when x=1,y=11 and when x=2,y=5.find the values of y when x=4. 2.find,correct to the nearest naira,the compound interest on 85750 naira for 3 years at 5%per annum.

Question

1. A quantity is partly constant and partly varies inversely as the square of x.write the relationship between x and y when x=1,y=11 and when x=2,y=5.find the values of y when x=4.                                                  2.find,correct to the nearest naira,the compound interest on 85750   naira for 3 years at 5%per annum.

oobleck · Answer

y = a + b/x^2 So, using the two given points, a + b = 11 a + b/4 = 5 Now find y when x=4 85750(1.05^3 - 1)