# 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 59956: Yolanda invested a portion of \$14,000 at 7.25% interest and the balance at 9.5% interest. How much did Yolanda invest at each rate if her total income from both investments was \$1240 after one year? Click here to see answer by tutorcecilia(2152)

 Question 59984: solv the formula for the specifed variable A=1/2h(b1+b2) solve for b1 Click here to see answer by tutorcecilia(2152)

 Question 58753: . Bear population. To estimate the size of the bear population on the Keweenaw Peninsula, conservationists captured, tagged, and released 50 bears. One year later, a random sample of 100 bears included only 2-tagged bears. What is the conservationist estimate of the size of the bear population? Click here to see answer by tutorcecilia(2152)

 Question 60027: write an algebraic expression to represent the cost of M gallons of gasoline if each gallon cost \$1.45 Click here to see answer by uma(370)

 Question 60035: Put these rates in order from smallest to largest 9ft.per hour 1/7 foot per min 1.82 inches per min Click here to see answer by greenman(5)

 Question 60162: Can someone help me solve this problem? I need to solve: 4(x + 2) - 3x + x - 6 Thank you, Lyn Click here to see answer by funmath(2925)

 Question 60385: my question is about word problems: Vince is a professional football player. He has already made 75 touchdowns. each year, he makes 5 more touchdowns. Write a equation to show how many touchdowns he has made after x years p.s please help me as soon as possible! thank you! Click here to see answer by checkley71(8403)

 Question 60398: -8=-(x+4) [ditribute negative into the ()] -8=-x-4 -8+4=-x-4+4 [add 4 on both sides] -4=x x=-4 Click here to see answer by ayelet(1)

 Question 60677: Find f(-2) for f(x) = 1 - 2x Click here to see answer by checkley71(8403)

 Question 60680: Can you please show me how to work this problem step by step? -7+x+4+4x-x-3+6 Thank you! Click here to see answer by checkley71(8403)

 Question 60824: Do I arrange this problem x+y=12 I do not know if I put 2x under the x Please show me! y=2x Click here to see answer by checkley71(8403)

 Question 60749: i need to solve and graph this problem 2x-9 > 3(x-2) Click here to see answer by tutorcecilia(2152)

 Question 60945: Can anyone help getting this set up and solved? Thanks Solve 5x^2 + 2x - 1 = 0 Thanks! Click here to see answer by checkley71(8403)
 Question 60945: Can anyone help getting this set up and solved? Thanks Solve 5x^2 + 2x - 1 = 0 Thanks! Click here to see answer by Earlsdon(6287)

 Question 60946: I can't figure this one out. Does anyone think they can help me? Thanks for your efforts. Evaluate the discriminant to determine the nature of the roots of: 15x^2 + 2x = 1 DO NOT SOLVE THE EQUATION. Thanks for any assistance. Click here to see answer by joyofmath(189)

 Question 60985: Hopefully someone can help me with this one. Thanks! x / x-2 = 2/x-3 we are solving for x. Thanks! Click here to see answer by joyofmath(189)

 Question 60990: How many liters of pure antifreeze must be added to 20 liters of a solution that is 25% antifreeze to obtain a 50% solution? Tried using the given formula from teacher but get a negative 10 answer?? .25(20)= .50(20+x) Click here to see answer by Earlsdon(6287)
 Question 60990: How many liters of pure antifreeze must be added to 20 liters of a solution that is 25% antifreeze to obtain a 50% solution? Tried using the given formula from teacher but get a negative 10 answer?? .25(20)= .50(20+x) Click here to see answer by jainenderkapoor(61)

 Question 60997: Roland traveled from Nashville to St. Louis, a distance of 300 miles. If he had increased his speed by 10 mph he would have arrived at St. Louis an hour and 30 minutes sooner. What was his speed? Click here to see answer by checkley71(8403)

 Question 61039: P=a+b+c for c E=mc^2 for c y+x=a for y 3x-y=7 for y Click here to see answer by tutorcecilia(2152)

 Question 61386: Evaluate xy^2(xy-x^2) if x = -1/3 and y = 1/6 Click here to see answer by funmath(2925)

 Question 61447: solve the formula for the given variable k=c+273 for c Click here to see answer by DJ_Sammie(24)

 Question 61453: how do you solve for x when given (3x+5) and 4x? Click here to see answer by DJ_Sammie(24)

 Question 61553: Hi, I am a Distance Education student. I am having trouble figuring out how to set this problem up to solve it. Thank you for your help :) Problem: Lake Perris charges boaters different user fees depending on the horsepower (hp) rating of their engines. Zero-5 hp boaters are charged \$5 per day, 6-50 hp \$12, and over 50 hp \$25 per day. If a total of 49 boaters used the lake on a certain day and paid \$699 in fees, how many of each type boater used the lake, if there were ten more 6-50 hp boaters than zero-5 hp boaters? Click here to see answer by asha(30)

 Question 61696: Use substitution to solve for x and y 4x - y = -7 2x + 2y = 4 Click here to see answer by jai_kos(139)

 Question 61831: How do I solve for: 3y+z=am-4y, for y Click here to see answer by DJ_Sammie(24)
 Question 61831: How do I solve for: 3y+z=am-4y, for y Click here to see answer by angelar(2)

 Question 61884: If y varies inversely as x^2, and y = 2 when x=4, what is the constant of variation? Click here to see answer by stanbon(57342)