Complete the square for the expression. write the resulting expression as a binomial squared.
x^2 + 4x +
a. x^2 + 4x + 4 = (x + 4)^2
b. x^2 + 4x + 16 = (x + 2)^2
c. x^2 + 4x + 4 = (x + 2)^2
d. x^2 + 4x + 16 = (x + 4)^2

Anewborn baby had about 26,000,000,000 cells. an adult has about 4.94 times 10 to the 13 power cells. how many times as many cells does an adult have than a newborn

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

The cost of a taxi ride includes an initial charge of $2.00. if a 5km ride cost $6.00 and a 10km ride cost $10.00, determine the cost of a 15km ride.