# Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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 Algebra: Expressions involving variables, substitution Solvers Lessons Answers archive Quiz In Depth

 Question 447921: coffee grounds inc has two limds of coffee. Coffee A costs \$9 per kg and coffee B costs \$6 per kg. how many kilograms of each should be combined to obtain 150 kg of a blend worth \$8 per kg Click here to see answer by mananth(12270)

 Question 448061: Alvin paddles for 3 hours with a 5 km/ hr current to reach a campsite. The return trip against the same current took 8 hours. Find the speed of the boat in still water. Click here to see answer by jorel1380(2518)

 Question 448747: I am using substitution. I got this problem: y=3x-1 3x-y=-1. I got to this point: 3x-(3x+1)=-1 , but i cant find x Click here to see answer by Alan3354(30993)

 Question 448852: I really can't figure this one out ! What is the simplified form of the expression ? 1/3 - x / 1/2-y Please show me how to do this - so I can figure others out. Thank you Click here to see answer by stanbon(57415)

 Question 448873: Soybean meal is 14% protein, cornmeal is 7% protein. How many pounds of each should be mixed together in order to get 280-lb mixture that is 13% protein. How many pounds of cornmeal? How many pounds of soybean? Click here to see answer by ankor@dixie-net.com(15664)

 Question 448926: If P=12 8 x p = q x 6 q = _______________ Click here to see answer by TheDoctor(14)

 Question 449570: Please help! I have this story problem: In 1991, the life expectancy for males in a certain country is 66.4 years. In 1996, it was 70.0 years. "E" is to represent the life expectancy in year t and t represents the number of years since 1991. E=__(t) + __ (round to the nearest tenth) Use the function to predict the life expectancy of males in 2009. E(18)=__ (round to the nearest tenth) Click here to see answer by rwm(914)

 Question 449679: Hello: I need help with the following word problem: A university reported that its enrollment increased from 11,934 students in 2006 to 12,228 students in 2007. a) What is the ratio of the number of students in 2007 to the number of students in 2006? b) From the result in part a, determine the growth factor. Write it in deciomal form to the nearest thousandth. c) By what percentage did the enrollment increase? I believe the easy part is part a which I have determined to be 1.025. I am stumped by the rest. Thank you so much for your help. Julie Click here to see answer by scott8148(6628)

 Question 449840: how do you solve this problem -3x-2+2x+7=-7-5x thank you very much for you help Click here to see answer by robertb(4012)

 Question 450217: I REALLY need help with parallel & Perpendicular lines! Here's what it says: Write an equation in slope-intercept form of the line that passes through the given point and is parallel to the graph of the equation. y=3x-5;(21,22) Slope i will use _________ Point slope form: Slope-Intercept form: Also, y=x-15;(o,9) and 2x+1=y;(3,1) For the last one it says i have to find slope, but isn't the slope already 2 ? Please, Please, Please HELP!!!! Click here to see answer by ankor@dixie-net.com(15664)

 Question 450419: Fabulously fit offers a membership for \$35 per month plus a \$50 enrollment fee. The fitness studio offers memberships for \$40 per month plus a \$35 enrollment fee. In how many months will the fitness clubs cost the same? What will the cost be? Click here to see answer by mananth(12270)

 Question 450412: Fabulously fit offers a membership for \$35 per month plus a \$50 enrollment fee. The fitness studio offers memberships for \$40 per month plus a \$35 enrollemnt fee. in how many months will the fitness clubs cost the same? what will the cost be? Click here to see answer by mananth(12270)

 Question 450461: Newton's Second Law of Motion states that the acceleration of the object varies inversely with its mass. A constant force acting upon an object with mass 9 kg produces an acceleration of 5 m/s (squared). The acceleration of another object produced by the same force is 3 m/s (squared). What is the mass of this object? Click here to see answer by richard1234(5390)

 Question 450501: Graph the equation and identify the y-intercept x+4y=20 Click here to see answer by mananth(12270)

 Question 450502: Graph the equation and identify the y-intercept. y= 2/3x-5 Click here to see answer by jorel1380(2518)

 Question 450868: y= 3x + 11 y= -2x + 1 Click here to see answer by jorel1380(2518)

 Question 451212: I need help with a word problem. In 1994, the life expectancy of males in a certain country was 65.5 years. In 1998, it was 69.0 years. Let E represent the life expectancy in year t and let t represent the number of years since 1994. E(t)= _t+_ E(9)= Click here to see answer by ewatrrr(10682)

 Question 451138: one canned juice drink is 30% orange juice; another is 5% orange juice. how many liters of each should be mixed together in order to get 25L THAT IS 25% ORANGE JUICE? HOW MANY LITERS OF 30% ORANGE JUICE SHOULD BE IN THE MIXTURE? How many liters of 5% orange juice should be in the mixture? Click here to see answer by jorel1380(2518)

 Question 449948: Given the function H(s)=6s+6 find the following: H(2) H(-3) H(6.8) Click here to see answer by solver15(27)

 Question 448994: 2m+n=11 m-4n=37 Solve by substitution method. what is the solution of the system? Click here to see answer by solver15(27)

 Question 447782: what is the product of (xy-4z) and (3x+2z-7)? Click here to see answer by solver15(27)

 Question 444106: Distribution and Combining Like Terms Simplify: 7n + 5(-2 – 5q) – 3n + 2q + 7 Click here to see answer by solver15(27)