18. For what value of k are the graphs of y = 3x + 4 and 2y = kx + 9 parallel?

Solve the problem by making up an equation. a child is 12 years old, and his father is 32 years older. in how many years will the age of the father be 3 times the age of the child?

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?