Which of these num. are prime:

1, 11, 21, 51?

Evaluate the expression. 11 + 62 - (-3) - 7

If 3 (4-2x) - 5 (-2x+1) = 1-3x, then x=

The average speed of a race car is 240 km/h. if the race is 200 laps long with each lap being 4.02 km, how long will the race last if there are no wrecks, rain delays, or debris on the track?

If ab = 11, what is a^2b^2

The sum of two consecutive integers is at least 52. What is the least possible pair of integers? A.) 27 and 28 B.) 25 and 26 C.) 24 and 25 D.) 26 and 27

Nine times the sum of a number and 3 is 2

Determine whether the given set S is a subspace of the vector space V. A. V={/mathbb R}^2, and S consists of all vectors (x_1, x_2) satisfyingx_1^2 - x_2^2 = 0. B. V=M_n ({/mathbb R}), and S is the subset of all symmetric matrices C.

Name three angles that sum to 180 degrees

Count back by one with the number 953

Write two multiplication sentences that have a product of 16