Using the linear combination method, what is the solution to the system of linear equations 7 x minus 2 y = negative 20 and 9 x + 4 y = negative 6? (–3, 2)
(–2, 3)
(2, –3)
(3, –2)

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

Sara has 2 2/3 cup taco meat. she needs 1/6 cup to make one taco. how many tacos can sara make with the taco meat she has?

Matt makes a birdhouse.he needs 2 1/3 cans of paint for each birdhouse.he has 10 cans of paint.how many bird houses can be made? ( i need this answered in the next 9 hrs )