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

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 Question 580780: A = P + Prt (Simple interest formula) for t Click here to see answer by Alan3354(34679)

 Question 580845: I have tried this problem over and over but each time my professor tells me that it's wrong. Can you help me figure out what i am doing wrong? 3/n + 6/n - 1/4 My answers so far: 9/n - 1/4 36/8n - 1/4 36/5n Click here to see answer by Alan3354(34679)

 Question 581524: the expression 4 cubed times 4 to the 5th power is equivalent to what Click here to see answer by Earlsdon(6294)
 Question 581524: the expression 4 cubed times 4 to the 5th power is equivalent to what Click here to see answer by algebrahouse.com(1283)

 Question 582436: The coefficient of 9(14)P is _____. A. 9 B. 14 C. 126 Click here to see answer by jim_thompson5910(29613)

 Question 582894: A plane that can normally travel at 250 mph in calm air is flying onto a headwind of 25 mph. How far can the plane fly in 3 hours? Click here to see answer by ankor@dixie-net.com(16527)

 Question 583938: How do I solve for x and y when solving systems of equations by substitution y=6x-11 -2x-3y=-7 if I use the y=6x-11 into -2x-3y=-7 -2x-3(6x-11)=-7 do I multiply -3 and 6x? Click here to see answer by ankor@dixie-net.com(16527)

 Question 584848: 7x+4y=-34 x=-2-2y 7(-2-2y)=4y=-34 -14-14y+4y=-34 -10y+-14= could you show me step by step please? how did they get y=2 x=-6 Click here to see answer by Alan3354(34679)

 Question 584933: 5 times a number ,x, decreased by y Click here to see answer by jim_thompson5910(29613)

 Question 585135: ( (6 + 4)(6 + 4)) - (25 x 2)? what is the answer? Click here to see answer by richwmiller(10283)

 Question 585183: 0.3x-0.2y=4 0.5x+0.5y=-45/17 3x-2y=40 5x+5y=-450/17 15x-10y=200 15x-15y=1350/17 _________________ -25y= 4750/17 dont know how they got this? y=-190/17 3x-2(-190/17)=40 100/17 Solution 100/17,-190/17 Click here to see answer by stanbon(60778)

 Question 585445: -9x+ y=20 9x+16y=14 y=20+-9 9x + 16 (20+-9x)=14 9x+320=144x=14 153x+320=14 I understand up to here x= -2 dont understand how they got these answers could you show me step by step please? y= 2 Click here to see answer by jim_thompson5910(29613)

 Question 585482: 2x2y=-3 2x-y=5 2x+2(2x-5)=-3 2x+4x-10=-3 6x=7 x=7/6 I understand up to here but then I am confused they got solution 7/6,-8/3 can you please show me step by step please? Click here to see answer by Alan3354(34679)

 Question 589191: Find two consecutive integers such that the sum of their squares is 61 Click here to see answer by AnlytcPhil(1321)
 Question 589191: Find two consecutive integers such that the sum of their squares is 61 Click here to see answer by mathhelp@(10)
 Question 589191: Find two consecutive integers such that the sum of their squares is 61 Click here to see answer by Alan3354(34679)

 Question 589190: Find three consecutive positive integers such that the product of the second and third integers is 20 Click here to see answer by Alan3354(34679)

 Question 589652: How do I solve for f when h=5f, for f? f=?? Click here to see answer by ankor@dixie-net.com(16527)

 Question 590022: Solve the formula for the indicated variable. (9/5)C + 32 = F Solve for C Click here to see answer by stanbon(60778)

 Question 590023: Solve the formula for the indicated variable. A=1/2bh Solve for h Click here to see answer by Alan3354(34679)

 Question 590119: Solve the system by substitution or elimination. If the system is inconsistent or has dependent equations, say so. x+y=12 y=4x-3 A) 3,9 B) 4,9 C) 2,12 D) 9,3 Click here to see answer by Alan3354(34679)

 Question 590123: Solve the system by substitution or elimination. If the system is inconsistent or has dependent equations, say so. y= -4/5x 4x -5y= -6 A) -3/4, 3/5 B) 3/4, 3/5 C) -3/4, -3/5 D) 0; inconsistent system Click here to see answer by Alan3354(34679)

 Question 590639: A number plus the reciprocal of the number is 5/4 of the number. What is the number? Click here to see answer by bucky(2189)

 Question 590116: Tell how many solutions the system has. do not actually solve. 5x+4y=-1 25x+20y=-5 Click here to see answer by bucky(2189)

 Question 590798: I am having a terrible time doing word problems in algebra, simple for some but not for me. Could someone please help with two problems, thank you very much. A university bookstore recently sold a wire bound graph-paper notebook for \$2.50, and a college-ruled notebook for \$2.30. At the start of spring semester, a combination of 50 of these notebooks were sold for a total of \$118.60. How many of each type were sold? A bricklayer and an electrician together spend 90 hours working on a new house. If the bricklayer earns \$12 per hour, the electrician earns \$16 an hour, and the owner pays them a total of \$1350 for their work, how many hours does each worker spend on the house? Click here to see answer by Theo(3556)

 Question 123811: Problem Solving With Systems of A line: How to Solve The difference of the measures of two supplementary angles is 35*. Find both angle measures. The sum they add up to is 180*. Click here to see answer by eschwartz(9)