Find the Hcf
15 and 3​

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

Ihave trouble finding the nth term of a linear sequence

Rewrite the following quadratic functions in intercept or factored form. show your work. y = x^2 + 7x + 10