The world population in 2013 was about 7.125 billion. In 2003, it was about 6.357 billion. Which number represents the increase in the world population between 2003 and 2013?
A.
0.0768 × 107
B.
0.768 × 108
C.
7.68 × 109
D.
7.68 × 108

What does x = in this equation x+3+2x=x+5

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations