Please help me with these

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.