PQRS is a trapezium with PQ=2SR. PQ=2a and PS=b. Find QR in terms of a and b in its simplest form.

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

What term makes it inconsistent y=2x - 4

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0