(3x^2+3)(4+x^3) what the polynomial ?

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.

The triangles are similar. what is the value of x? enter your answer in the box.

Simplify each expression for 18, 20, and 21