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Mathematics

please help thanks evaluate this expression for these number: a = 2 b = 4 c = 3 c - a

Lin ordered 250 pens and 250 pencils for a theatre club fundraiser. The pens cost 11 cents more than the pencils. If Lin's total order costs $42.50, find the cost of each pen and pencil.

 a sample of 400 provided a sample proportion = .175

What is the value of 3/8x - 4.5 when x= 4.0 

(3x2 + 7x + 10) - (3x2 - 12x - 10)

To average a 90% after scoring an 82% and 96%, what do you need to score?

Carter hikes from the top of a hill that is 120 and two thirds feet below sea level down into the Valley that is 43 and two thirds. What is the difference in elevation between the top of the hill and the​ valley?

Two professors are applying for grants. ProfessorJane has a probability of 0.62 of being funded. Professor Joe hasprobability 0.25 of being funded. Since the grants are submitted totwo different federal agencies, assume the outcomes for each grantare independent. 1.What is the probability that both professors get their grantsfunded? Give your answer to four decimal places. 2.What is the probability that at least one of the professors will befunded? Give your answer to four decimal places. 3.What is the probability that Professor Jane is funded but ProfessorJoe is not? Give your answer to four decimal places. 4.Given at least one of the professors is funded, what is theprobability that Professor Jane is funded but Professor Joe is not?Give your answer to four decimal places.

Mr. Rodriguez plans to drive from New York to Chicago, a distance of 850 miles. How long will he take to make the trip if he averages 50 miles per hour?

Jennifer cut a length of rope into two pieces. One piece was 2 feet 9 inches long, and the other piece was 3 feet 5 inches long How long was the rope before it was cut?

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