# Questions on Algebra: Inverse operations for addition and multiplication, reciprocals answered by real tutors!

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 Algebra: Inverse operations for addition and multiplication, reciprocals Solvers Lessons Answers archive Quiz In Depth

 Question 65485: Can someone please just lay out the step by steps to determine and solve Inverse variations and direct variations? Click here to see answer by stanbon(57347)

 Question 66837: During one of the Chicago Bears' offensive drives, they gained 12 yards on one play. On the next play, the quarterback was sacked for a loss of 6 yards. Write and solve an addition sentence representing the net yards for these 2 plays. Click here to see answer by checkley71(8403)

 Question 66885: What is the reciprocal of 3x over 7? Click here to see answer by josmiceli(9678)

 Question 67438: Find an equation of variation when y varies inversely as x and y=7 when x=5. [a] y=5/7x [b] y=7/5x [c] y=x/35 [d] y=35/x thank you. Click here to see answer by venugopalramana(3286)

 Question 67691: There are three angles in a triangle. lets call them A, B, C. One property of triangles is that the sum of the interior angles is always 180,. so our firs trelatonship is: A + B + C = 180 iN THE DIAGRAM, LETS SAY THAT ANGLE a HAS A VALUE OF X ANGLE "B HAS A VALUE OF (X-8) AND ANGLE C is our unknown. So we can bow sustitute some value in our relationship. x + ( x + 8) + C =180 Rearranging to isolate C, we get 180 - x - ( x+ 8) = c This equation doesn't put any limits on what C can be , but the problem does. It tells us that what ever value we use for X, the equation must work out so that C is no larger than 30. This constraint creates an inequality: c < 30 - We now have two expressions for the same thing - the value of the angle C. We can set them equal to each other. So our final expression is: Click here to see answer by 303795(595)

 Question 67688: if L is the inside leg measurement then the saddle height, s, must be 109% of the inside leg measurement. The relationship is: Sn = 109%L If Brenda's saddle is 36 inches, then our answer is: Click here to see answer by tutorcecilia(2152)

 Question 67851: Hello, I hope you can help me solve this. Please forgive me if I don't write it in the appropriate manner: What is the inverse of 2 raised to the power of 8 divided by 2 raised to the power of 2? Thank you for your help. Regards Lisa McCallum Click here to see answer by stanbon(57347)

 Question 67969: I need find the inverse of the following function: f(x)=2(x+12). This is not from a test Click here to see answer by stanbon(57347)

 Question 68208: I need help with problem 43 in chapter 2 section 3. The problem is x+7/6=2x-7/6 Click here to see answer by checkley71(8403)

 Question 68527: This is 5th grade math and I have TOTALLY forgotten how to do this stuff!!! Please try to explain to me how to solve and check this type of a problem, so I can remember how to do this!!! x/5=20/4 Click here to see answer by stanbon(57347)
 Question 68527: This is 5th grade math and I have TOTALLY forgotten how to do this stuff!!! Please try to explain to me how to solve and check this type of a problem, so I can remember how to do this!!! x/5=20/4 Click here to see answer by rmromero(383)

 Question 68897: I have the equation but i cant find the answer please in a step by step show me how to do this my equation so far 8+j-2/3j (equal or less than) 18 8+1/3j (equal or less than) 18 Click here to see answer by rmromero(383)

 Question 68898: I have the equation but i cant find the answer please in a step by step show me how to do this my equation so far 8+j-2/3j (equal or less than) 18 8+1/3j (equal or less than) 18 Click here to see answer by rmromero(383)

 Question 68917: I know the answer to the maths question below is x = 3 but I have forgotten the method to calculate it. Can you help me? 9 - x divided by 2x - 3 = 2 Click here to see answer by Earlsdon(6287)

 Question 69178: How do you solve this: w/5=10/80 what is the variable: w stand for? Click here to see answer by checkley75(3666)

 Question 70841: I think that this is the topic. I need to solve for x in this equation. 15-2x=5 I don't know how do solve for x and the steps that you do inorder to get the correct answer. Click here to see answer by checkley75(3666)

 Question 70962: 1) A=1/2h(a+b)for a 2)what is 16% of 90? Click here to see answer by checkley75(3666)

 Question 71358: My daughter is having trouble with the following problem, and I can't remember how to do it, let alone explain it... Please help! (x-5)/6 = (x-11)/2 Click here to see answer by Nate(3500)
 Question 71358: My daughter is having trouble with the following problem, and I can't remember how to do it, let alone explain it... Please help! (x-5)/6 = (x-11)/2 Click here to see answer by checkley75(3666)

 Question 71514: Need the steps to solve the following equation. 3x+1 = x-5 Click here to see answer by Earlsdon(6287)
 Question 71514: Need the steps to solve the following equation. 3x+1 = x-5 Click here to see answer by checkley75(3666)

 Question 71513: Need the steps to solve the following equation. 3x+1 + x-5 Click here to see answer by checkley75(3666)

 Question 71781: we are working on a problem that is x over 5 plus 6 equals 21 and we are stuck, can you assist? Click here to see answer by ankor@dixie-net.com(15652)

 Question 73959: could someone help with this problem? If f(x)=x-3 g(x)=2x+5 find fog and gof i did this but i am not sure if i have even started this right.. f=x-3/x x=-3/f-1 g=2x+5/x x=5/g-2 any help would be appreciated..thanks Click here to see answer by ffc_01(9)

 Question 73977: I am having difficulty with this equation. Find the inverse of the function, f(x) = (3 + 2x)/(2-5x) Click here to see answer by jim_thompson5910(28595)
 Question 73977: I am having difficulty with this equation. Find the inverse of the function, f(x) = (3 + 2x)/(2-5x) Click here to see answer by Earlsdon(6287)

 Question 74287: g(x)=x=5;h(x)=x-5 , are these functions inverse if so, why? Click here to see answer by stanbon(57347)

 Question 77794: A regular tank can be filled with water by two pipes (one larger, one smaller) in 11 1/9 mins. If the larger pipe alone takes 5 mins less to fill the tank than the smaller pipe, find the time each pipe takes to fill the tank? p/s: I know the answer can be evaluated uses this equation, 1/x + 1/(x-5) = 1/(11 1/9) x (smaller tank) = Ans, x-5 (larger tank) = Ans where x is the amount of time required for the smaller tank alone to fill the tank. BUT, 1)WHY do you use the reciprocal of each to derive at the equation? 2)What is the concept behind the equation here? Has it got to do with the definition of reciprocals? or do we solve it using ratio? Click here to see answer by ptaylor(2048)