How would you graph x > 0 on a number line?

The area of a rectangle is 54x^9y^8 square yards.if the length of the rectangle is 6x^3y^4 yards,which expression represents the width of the rectangle in yards

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Yvaries directly as x. y =90 when x=6. find y when x=13