Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 80.

The figure above shows the lengths of thesides of a rectangle in cm. find the valuesof x and y and then the area of the rectangle. sides: top= 3x - yleft= 3y + 4bottom= 2x + yright= 2x - 3 use both methods, elimination and substitution, if possible.

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much