Expand (2x + 3)(x - 1). Your answer should be a polynomial in standard form

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.