The sum of three different numbers is 18. if every number is a prime number, what are three numbers?
i don't know what prime numbers are, so i can't answer this.. some ?

The height of a triangle is 4 in. greater than twice its base. the area of the triangle is no more than 168 in.^2. which inequalitycan be used to find the possible lengths, x, of the base of the triangle?

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?