Which system is equivalent to
1
5x2 + by2 = 50
(7x² + 2y² = 10²
(a) 5x2 +by2 - 50
7-21x² - by²= 10
(b) 5x2 + by2 = 50
-21x²-by? - 30
(c) 35x2 +42y2 = 250
(-35x2 – 10y2 --50
(d) 35x2 +42y2 = 350
-35x2 - 10/2 --50

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is: