Please anyone help!!

If 20% of a number is 35, what is 50% of that number?

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)

If you invest 1,500 today in a bank that gives you a 5 percent annual interest rate, which of these items can you buy in two years? a. electronics worth $1,650 b.fitness equipment worth $1,700 c.a holiday package worth $2,000