What is the solution to the following system of equations?
y = −x2 − 5x − 4
y = −x2 + 9x − 18

1. (−1, −10)
2. (1, −10)
3. (−1, 10)
4. (1, 10)

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a seven or king. (b) compute the probability of randomly selecting a seven or king or jack. (c) compute the probability of randomly selecting a queen or spade.

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241. a) 0 b) 1 c) 2 d) 1 2

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*