Find the number of integers from 1 to 1000 which contain at least one 7 in their digits.

Use the matrix-column representation of the product to write each column of ab as a linear combination of the columns of a.

The cash price of a television is $580.the hire-purchase price of the television is $865.the hire-purchase price is an initial deposit of n% of the cash price and 6 equal monthly payments of $120.find the value of n.

Which of the following graphs represents the function f(x) = 2^x