The law of cosines is a2+b2 - 2abcosC = c^2 find the value of 2abcosC ... A. 40 B. - 40 C. 37 D. 20

(The sides are 2,4, and 5; A to B is 2, B to C is 4, and A to C is 5.)

Tom gets out of school at 3 p. m. but goes into school at 7:30 A. m. How many hours is Tom in school?

Charlotte embroidered a piece of cloth with a length of 4 meters and a width of 2 meters in 412 hours. What is the approximate speed, in square meters per hour, at which Charlotte can embroider? Round your answer to the nearest whole number.

Which statement describes the system of equations? 5x - 3y = 34 x - 2y = 4 It has infinitely many solutions. It has no solution It has one solution (24/13, - 14/13) It has one solution (8.2).

Which number satisfies the inequality 9h + 15 > 55?

Which of the following is the equation of a line parallel to 3y=6x+5 that passes through (2,3) ? A. y+2x=1 B. y = 3x-2 C. y=2x-1 D. y+4=8x

Which number in the set {-486, 0, 259} is a natural number?

Find F of G of X where f of x equals 9 over X and G of x equals x over x + 1

Jane is a better tennis player than Jack is. If the probability that Jane will beat Jack in any given game is 0.7, what is the probability that they will each win one game if they play two games

Maya is driving 120 miles to her grandmother's house. She drives 35% of the distance before stopping for lunch. How far does she drive before lunch?

How many decameters are there in 4.5 kilometres