The cost of an article without vat is rupees 3500 and including vat is rupees 3850 find the rate of vat

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

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