# Questions on Algebra: Equations answered by real tutors!

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 Algebra: Equations Solvers Lessons Answers archive Quiz In Depth

 Question 375865: Is there an equation in algerbra for the number of days in a year. My wife says there is but don't remember it. If there are 365 days in a year, 52 weeks in a year and 7 days in one week then 7 x 52 = 364. Where does the other day come from. Thanks Hugh Click here to see answer by Fombitz(13828)

 Question 375952: A family has two cars. The first car has a fuel efficiency of 40 miles per gallon of gas and the second has a fuel efficiency of 30 miles per gallon of gas. During one particular week, the two cars went a combined total of 1650 miles, for a total gas consumption of 45 gallons. How many gallons were consumed by each of the two cars that week? Click here to see answer by stanbon(57984)
 Question 375952: A family has two cars. The first car has a fuel efficiency of 40 miles per gallon of gas and the second has a fuel efficiency of 30 miles per gallon of gas. During one particular week, the two cars went a combined total of 1650 miles, for a total gas consumption of 45 gallons. How many gallons were consumed by each of the two cars that week? Click here to see answer by mananth(12270)

 Question 376008: How would I solve the equation: 3m-5(4-m)=-23+5m I tried solving it this way: 3m-5(4-m)=-23+5m 3m-20+5m=-23+5m 8m-20=-23+5m -5m -5m 3m-20=-23 +20 +20 3m=-3 Click here to see answer by jim_thompson5910(28717)

 Question 375447: A store mixes kenyan coffee worth \$11 per kilogram and turkish coffee worth \$14 per kilogram. the mixture is to sell for \$13 per kilogram. find how much of each should be used to make a 480 kilogram mixture. how many kilograms of the kenyan coffee should be in the mixture???? Click here to see answer by nyc_function(2733)

 Question 376072: Hello, can you please help me with the following equations. I am totally lost and still cannot grasp this. Could you please show the steps to getting the answer as well as I will use this as my study references.Thank you so much. 1. 5x + 3 < -2 2. 6x – 5 greater then or equal to -17 3. -9x + 4 less then or equal to -14 4. 9( x – 3 ) greater then or equal to -9 5. 5(x – 2) greater then or equal to 3(x + 2) Click here to see answer by rfer(12731)

 Question 376100: I need help to solve the equation 26+8y-18=0 Click here to see answer by nerdybill(7012)

 Question 376093: Find measure of am angle whose compliment is 8 times its measure. I have no idea how to solve this. Click here to see answer by ankor@dixie-net.com(15747)

 Question 376031: A small publishing company is planning to publish a new book. The production costs will include one-time fixed costs (such as editing) and variable costs (such as printing). There are two production methods it could use. With one method, the one-time fixed costs will total \$15,248 , and the variable costs will be \$25.50 per book. With the other method, the one-time fixed costs will total \$71,570 , and the variable costs will be \$12.00 per book. For how many books produced will the costs from the two methods be the same? Click here to see answer by ankor@dixie-net.com(15747)

 Question 376148: 6x+3y=-3 -5x+y=20 6x+3y=-3, -5x+y=20 add 5 to both ends of 2nd equation -5x+5x+y=20+5x y = 20+5x substitute y in the first equation 6x+3(20+5x)=-3 6x+60+15x=-3 21x=-63 divide by 21 x= -63/21 x= -3 plug value of x into the second equation -5(-3)+y=20 15+y=20 y=5 Solve by substitution method Click here to see answer by mananth(12270)

 Question 376186: How do you know when an equation has no solution? Click here to see answer by Fombitz(13828)

 Question 376076: Pls help! If you can answer either one of them, I am so appreciated. 1.(x-2)(x+3)^2 / x^4-13x^2+36. 2. If polynomial p(x)=2x^3 -3x^2-10 has exactly one real zero r, -1<=r<=1, which following is true: A. -1<0 B. 0<1 or C.other answer? 3. what is a portion of graph of y= y|-|-x|| ? graph it. 4. what's X if 3x^2-2+7=0 then (x- 1/3)^2= ? 5. If y=b^x and b>1, which one is true: A log y b=x. B. log b x=y. C. other answer. 6. The radian measure of angle containing x degree is: A.Pi x/180 B. Pi x/ 180. C. other answer 7.If f(x)= x^2, when x>0 and c>1, then f(x^c)= ? 8 2log10x-log10y=? 9.for X# 0, if f(x)3x^2 and g(x)=1/2, then f(g(x))= ? 10 3+i/2-i = ? 11. If cotx^0=1, then x=? 12. Y=x+1 and x.y=2 so what x? 13. where can you defined tan X=? 15. What is the solution set of 2sin^2(x)-3sin(x)-2=0 where 0<=x<=2pi Click here to see answer by Fombitz(13828)

 Question 376395: solve the system by substitution 3x-y=50 x= -3y Click here to see answer by robertb(4012)
 Question 376395: solve the system by substitution 3x-y=50 x= -3y Click here to see answer by mananth(12270)

 Question 376461: multiply (-4x)^2(3x^8)^2 i am not sure to multiply the -4 and 3 then add expononts are do i square both then multiply. i need help please. Click here to see answer by Fombitz(13828)

 Question 376533: Simplify the expression (n + 5)(n + 2) Click here to see answer by ewatrrr(10682)

 Question 376532: Simplify the expression (n + 9)(n - 9) Click here to see answer by ewatrrr(10682)

 Question 376546: Factor the expression p2 - 25. Which of the following is a factor? Click here to see answer by ewatrrr(10682)

 Question 376540: Which of the following systems has (5,2) as a solution? I.) 3x + y = 1 2x + 3y = -11 II.) 4x + 3y = 26 3x + 7y = 29 Click here to see answer by edjones(7569)
 Question 376540: Which of the following systems has (5,2) as a solution? I.) 3x + y = 1 2x + 3y = -11 II.) 4x + 3y = 26 3x + 7y = 29 Click here to see answer by ewatrrr(10682)

 Question 376609: This problem is from Prentice Hall's Algebra 2 with trigonometry. (2x + 3)/(x-1) = 10/(x^2-1) + (2x-3)/(x+1) I am a mom helping several of the students with their math homework. However, I got the same answer they did on this problem but the book says there is no solution. We all got x = 1. What are we doing wrong. Thanks so much Debbie Click here to see answer by jim_thompson5910(28717)

 Question 376624: find the gcf of the product (15y+20)(15y+21) and help would be helpful. Thank you Click here to see answer by jim_thompson5910(28717)

 Question 376726: Find a positive value for k for which the polynomial can be factored. x^2-ky+29 Click here to see answer by robertb(4012)

 Question 376825: i am thinking of a number. if 7 is subtracted from the no. and the resultg is divided by 5 the quotient is 63. what number am i thinking of. Click here to see answer by scrappydeb(1)

 Question 377056: I need help figuring this equation out 4(x+3)=x Click here to see answer by oberobic(2304)

 Question 377170: Solve the system of linear equations (set z=a if dependent) I tried the problem below but I'm clearly missing something: Eqn 1: Eqn 2: 2(Eqn 1) - Eqn 2 Eqn 1 = x - 11y + 3z = -23 -19(Eqn 1) + Eqn 2 Eqn 1 = Let z = 2a I'm getting and that is not right. Did not solve further. Any help you can provide is appreciated! Click here to see answer by Alan3354(31538)