Questions on Algebra: Linear Algebra (NOT Linear Equations) answered by real tutors!

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Question 1090174: find the length of a side of each of two squares given that the sum of their perimeters is 44 feet and the sum of their area is 73 square feet.
Click here to see answer by MathTherapy(10552)

Question 1090259: Line 1 is defined by slope m = -2/3 and y intercept c = -1.
Line 2 passes through the points (x,y) = (2,-4) and (x,y) = (-3,6).
what are the equations for both lines?
Thanks

Click here to see answer by josgarithmetic(39617)

Question 1090317: When you reverse the digits in a certain two-digit number you decrease its value by 27. What is the number if the sum of its digit is 7? PLEASE HELP ME!
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Question 1090318: How many lb. of metal containing 70% gold must be combined with 9 lb. of metal containing 5% gold to form an alloy containing 25% gold?
Click here to see answer by ikleyn(52781)

Question 1090336: Jennifer wants to make 10 gal. of a 40% alcohol solution by mixing together a 10% alcohol solution and a 60% alcohol solution. How much of each solution must she us? This is so confusing please help me out!
Click here to see answer by KMST(5328)

Question 1090334: Abhasra wants to make 10 L of a 52% acid solution by mixing together a 65% acid solution and pure water. How much of each solution must she use?
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Question 1090554: Find the equation of the line that is perpendicular to the line x= -15 and contains the point (-2,9).
Type an equation
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Question 1090646: a zoo building a cat exhibit. somepace will be used for lions and other for leopards. 8 large cats in all. expenses 8000 for per year and 6000 per year for leopard . write an quation that an be used to find y. the yearly expense for 8 cats when the x of the cats are lions.
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Question 1090793: X cubed less than y cubed
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Question 1090795: Difference of a and b when a>b
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Question 1090893: how do you solve 3(x-3)squared + 2 = 26? I need the steps involved in solving the equation. I have the actual answer, but I can't make it work.
Click here to see answer by Alan3354(69443)

Question 1090922: How to solve this?
y=-4
-2x-4y+4z=20
-2x-2y-3z=26
Struggling here..
Click here to see answer by Edwin McCravy(20055)

Question 1090921: How to solve this?
x+3y-5z=-29
3y+2z=18
y=-5x-23
Click here to see answer by Alan3354(69443)

Question 1091039: please help me to solve this in long division.
x3+64
__________
x+4

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Question 1091277: suppose that the weight (in pounds) of an airplane is a linear function ofthe amount of fuel (in gallons) in its tank. when carrying 14 gallons of fuel, the airplane weighs 2091 pounds. when carrying 48 gallons of fuel, it weighs 2312 pounds. how much does the airplane weigh if it is carrying 60 gallons of fuel?

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Question 1091431: The square root of x+1=2 and the square root of x+1=-2 have the same solution x=3. Is this statement true?
Click here to see answer by ikleyn(52781)

Question 1091769: trevor is a salesperson who earns a weekly salary and a commission that is 7% of his weekly sales. In one week Trevor's sales were $952.00 and his weekly income was $466.64. In another week his sales were $2515.00 and his weekly income was $576.05.
a. Write a linear equation in slope-intercept form for Trevor's weekly income, y, in terms of his weekly sales, x.
b. What is Trevor's weekly salary?
Click here to see answer by josmiceli(19441)

Question 1091887: In 2020 a city's budget is projected to be $36 million. This is approximately 16/3 of the 2000 budget. What was the city's budget in 2000?
Click here to see answer by ikleyn(52781)

Question 1091890: An appliance store decreases the price of a 19-in. television set 26% to a sale price of $ 461.39. What was the original price?

Click here to see answer by josgarithmetic(39617)

Question 1091888: A store prices tapes by raising the wholesale price 50% and adding 35 cents. What must a tape's wholesale price be if the tape sells for $2.99
Click here to see answer by josgarithmetic(39617)

Question 1091929: Celeste wants to have her hair cut and perm and also go to lunch.She knows she will need $75. The perm costs twice as much as her haircut and she needs $5 for lunch.How much does the perm cost?

Click here to see answer by Fombitz(32388)

Question 1092250: 5 liters of pure alcohol was mixed with 10 liters of water.
What is the concentration of alcohol in this mixture?
Click here to see answer by ikleyn(52781)

Question 1092250: 5 liters of pure alcohol was mixed with 10 liters of water.
What is the concentration of alcohol in this mixture?
Click here to see answer by Boreal(15235)

Question 1092288: In 2020 a city's budget is projected to be $37 million. This is approximately 15/11 of the 2000 budget. What was the city's budget in 2000?
Click here to see answer by Theo(13342)

Question 1092283: The perimeter of a college basketball court is 114 meters and the length is twice as long as the width. What are the length and width?
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Question 1092354: In 2020 a city's budget is projected to be $27 million. This is approximately 11/8 of the 2000 budget. What was the city's budget in 2000?

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Question 1092557: please help me to answer: if six divided by 1 less than a number gives the same result as 15 divided by twice a number. find the number
Click here to see answer by josmiceli(19441)

Question 1092551: please help me to answer: the sum of lengths of all edges of a rectangular box is 140 dm and the distance from one corner of the box from the farthest corner
is 21 cm. What is the total surface area of the box?

Click here to see answer by ikleyn(52781)

Question 1092688: One hundred teachers attended a meeting.Each of them teaches either math or science .If you were to stop any two teachers and ask,''What do you teach?" at least one would answer,"math."

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Question 1092739: multiply and divide
(6.1 x 10 cubic meter) (4.0 x 10 squared)
------------------------------------------
4.4 x 10 to the 4th power
Click here to see answer by Fombitz(32388)

Question 1092738: the vector sum of a force of 12N and a force of 9N is 3N. the angle between them is
Click here to see answer by Fombitz(32388)

Question 1092827: Write the equation of the line perpendicular to 3y -x = 2 and passing through (9, -10)
Click here to see answer by MathLover1(20849)

Question 1092827: Write the equation of the line perpendicular to 3y -x = 2 and passing through (9, -10)
Click here to see answer by MathTherapy(10552)

Question 1092868: pls help me to answer: if the sum of the reciprocals of the roots of the equation 3x^2 + 7x + k is -7/3, what is k?
Click here to see answer by ikleyn(52781)

Question 1092876: Simplify :-
(2x�-5x�+6x-11)+(6x�+4x�-6x+12)-(5x�+3x�-9x+25)
Click here to see answer by Edwin McCravy(20055)

Question 1093020: Help me solve for "r"
(r/5) 0.25= (200-r/10) 1.25
Click here to see answer by Alan3354(69443)

Question 1093132: Y-wy=m solve for y
Click here to see answer by greenestamps(13200)

Question 1093081: The tangent line to a function f(x) at x=4 is found to be y = -5x+6.
Find g(4) and g'(4) if g(x) = 2f(x)+8
Click here to see answer by Edwin McCravy(20055)

Question 1093228: (5x+3)+3x^2-2 and (5x+1)+3x^2

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Question 1093795: n=9*3.14*t solve for t
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Question 1094000: The cross-sectional area of a certain tree is a linear function of time. If the radius of this circular cross-section was 2 feet in 1915 and 3 feet in 1990, what was it's radius in 2005?
Click here to see answer by Alan3354(69443)

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