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Question 918635: Determine whether each order pair is solution of the system of the system of linear equations
{ 3y=9x+6
{ 3x-y=-2
a)(-2,-4)
b)(0,-2)

A)IS (-2,-4) A SOLUTION? YES OR NO
B)IS (0,-2) A SOLUTION? YES OR NO
Click here to see answer by MathLover1(20849)

Question 918652: Solve the system of equations by the addition method.
{ 4x = 5y =5
{ 16x - 20y =10
Select the correct answer
A) The solution is_
B) There are infinitely many solutions
C) There is no solution
Click here to see answer by ewatrrr(24785)

Question 918656: Solve the system of equations by the addition method.
{ 4x = 5y =5
{ 16x - 20y =10

Select the correct answer is ether A,B OR C

A) The solution is_
B) There are infinitely many solutions
C) There is no solution
Click here to see answer by MathLover1(20849)

Question 918673: can someone just help me out here!!!!!!!!!

Doreen Schmidt is a chemist. she needs to prepare 24 ounces of a 9% hydrochloric acid solution. find the amount of 12% solution and the mount of 6% solution she should mix to get this solution.

How many ounces of the 12% acid solution should be in the mixture ________
How many ounces of the 6% acid solution should be in the mixture_________

Click here to see answer by ewatrrr(24785)

Question 918670: Doreen Schmidt is a chemist. she needs to prepare 24 ounces of a 9% hydrochloric acid solution. find the amount of 12% solution and the mount of 6% solution she should mix to get this solution.

How many ounces of the 12% acid solution should be in the mixture ________
How many ounces of the 6% acid solution should be in the mixture_________

Click here to see answer by ewatrrr(24785)

Question 918657: Solve the system of equations by the addition method.
{ 5x -7y =4
{ 7x-3y=4

Select the correct answer

A) The solution is___?
B) There are infinitely many solutions
C) There is no solution
Click here to see answer by Alan3354(69443)

Question 918643: Help needed!

Kathi and Robert Hawn had a pottery stand at the annual skipcack craft fair. They sold some of their pottery at the original price of $11.50 for each piece, but later decreased the price by $2. If they sold all 82 pieces and took in $821.00, find how many pieces they sold at the original price and how many pieces they sold at the reduced price?
The number sold at $11.50 is___
The number sold at $9.50 is ____
Click here to see answer by rothauserc(4718)

Question 919005: Dermot has �5000 and would like to invest it for two years. A special savings account is offering a rate of 3% for the first year and a higher rate for the second year, if the money is retained in the account. Tax of 41% will be deducted each year from the interest earned.
(a) How much will the investment be worth at the end of one year, after tax is deducted?
(b) Dermot calculates that, after tax has been deducted, his investment will be worth �5223�60 at the end of the second year. Calculate the rate of interest for the second year.
Give your answer as a percentage, correct to one decimal place.
Click here to see answer by Theo(13342)

Question 919172: An object is dropped from the top of a tower with a height of 1190feet.Neglecting air resistance, the height of the object at the times t seconds is given by the polynomial -16t^2+1190.Find the height of the object at t=1 second

The height of the object at 1 second is___ feet
Click here to see answer by DrBeeee(684)

Question 919177: Subtract (3x+2) from the sum (8x+2) and (7x+4)
The result is__
Click here to see answer by ewatrrr(24785)

Question 919171: An account now contains $12,480 and has been accumulating interest at a 8% annual rate, compounded continuously, for 5 years. Find the initial deposit. (Round your answer to the nearest cent.)
Click here to see answer by ewatrrr(24785)

Question 919178: Find the perimeter of a triangle.
One side (-2x^2+4x) feet
other side (9x^2+4) feet
bottom (4x-3) feet

perimeter= ___ feet
Click here to see answer by Alan3354(69443)

Question 919185: Perform the indicated operations.
[(9.4y^4-3.3y^3+2.9y)+(2.1y^3-5)]-5.5y^4+1.7y-9)=

Click here to see answer by MathLover1(20849)

Question 919321: Out of two supplementry angles one is 30degree more than the other .find the angles
Click here to see answer by ewatrrr(24785)

Question 919318: Three angles of a triangle are in the ratio 4:5:6. Find the angles.
Click here to see answer by ewatrrr(24785)

Question 919317: A man travels some distance at speed of 12km per hour and return at 9km per hour. if the total time taken by him is 2 hrs 20 min find the distance
Click here to see answer by Alan3354(69443)

Question 919447: what are the coordinates of the vertex of f(x)=-3x2+12x-9?
Click here to see answer by ewatrrr(24785)

Question 919537: How do you solve the following Polynomial Inequality?
x^4 - x^3 - 12x^2 greater than or equal to Zero
Click here to see answer by josgarithmetic(39617)

Question 919777: A mathematics teacher bought a $45 calculator for class use. Each student donated the same amount of money. If there had been 5 more students in te class, each would have had to pay 30 cents less. How many students were in the class?
Click here to see answer by ewatrrr(24785)

Question 920350: ind the interest rate needed for an investment of $5,000 to grow to an amount of $5,500 in 6 months if interest is compounded monthly
Click here to see answer by lwsshak3(11628)

Question 920511: Help would be much appreciated. The length of the side opposite of the 30˚of a 30˚-60˚-90˚ triangle is 12.7 centimeters. Find the length of the hypotenuse. (Answer with just the number- no label)
Click here to see answer by rothauserc(4718)

Question 920869: n=3 2 and 2i are zeros f(1)=-5
How do I solve this?
Click here to see answer by MathLover1(20849)

Question 920950: freddie is five times as old as elena,but in four years,he will be 8 years more than thrice as old as her.find the age of each now
Click here to see answer by ewatrrr(24785)

Question 920945: When a 49 pound weight is attached to a spring, the spring stretches 7 inches. Assume that the length of the spring y varies directly with the weight attached x. Write and solve a direct variation equation to find the length of the spring when a 63 pound weight is attached.
Click here to see answer by ewatrrr(24785)

Question 920943: Nola purchased 2.5 pounds of cheese for $10.50. Her mother purchased 3 pounds of the same cheese for $12.60. The cost of cheese varies directly with the number of pounds purchased. How much does one pound of cheese cost?
Click here to see answer by ewatrrr(24785)

Question 921125: Find C and a so that f(x) = Ca^x satisfies the given conditions.
f(0)=3 and f(3)=24
I got C=3 and a=2
But this is wrong because the answer is: 0,+-√3
Thank you for your help.
Click here to see answer by stanbon(75887)

Question 921465: How much water should be mixed to a 500 ml of 30% solution of alcohol to have a resulting concentration of 20%?
A.200 ml
B.250 ml
C.500 ml
D.1000 ml
E.2000 ml
Click here to see answer by Alan3354(69443)

Question 921574: can someone please help me with this question ? A water wheel rotates through the angle theta,the water level L behind the wheel changes according to the equation: L =2-2sintheta-4cos^2theta where l is measured in inches. determine the values of theta for which the water level is zero. find the exact values. do not use a claculator
Click here to see answer by Alan3354(69443)

Question 921587: Prepare 500ml of 50 percent of ethanol from both 90 percent and 30 percent ethanol.
Click here to see answer by Alan3354(69443)

Question 921586: Prepare 500ml of70percent from both 20 percent and 30 percent solution of ethanol.
Click here to see answer by Alan3354(69443)

Question 921601: Question 2
Click here to see answer by richwmiller(17219)

Question 921768: PLEASE CAN SOMEONE HELP ME.....(IF C/D-A/B=X,A=2C,and B=5D,WHAT IS THE VALUE OF C/D IN TERMS OF X?
Click here to see answer by MathLover1(20849)

Question 921977: A man repays a loan of Rs.3,250 by paying Rs.305 in the first month and then decreases the payment by Rs.15 every month. How long will it take to clear his loan?
Click here to see answer by josgarithmetic(39617)

Question 921976: a man repays a loan of Rs.3,250 by paying Rs.305 in the first month and then decreases the payement by Rs.rg every month. How long will it take to clear his loan?
Click here to see answer by josgarithmetic(39617)

Question 922061: Remove brackets and simplify
(x+4)(2x^+3x-1)
*note: 2x^ is 2x squared(to the power of 2)
Click here to see answer by josgarithmetic(39617)

Question 922410: x/3=20
Click here to see answer by Alan3354(69443)

Question 922512: $860 at5.5% compounded quarterly for 6 years.
Click here to see answer by ewatrrr(24785)

Question 922538: Give a counterexample to the claim log (s/t) = log s/ log t
The problem says it needs to be something I can prove without using calculator, is that possible?
Click here to see answer by richard1234(7193)

Question 922543: I need help to solve each system and show how to graph:
4x-y=6
-2x+3y=12
Thank you in advance
I tried to work and came up with an answer of 2,5
Click here to see answer by MathLover1(20849)

Question 922758: at what simple interst rate will a sum of money double itself in 5 years ?

Click here to see answer by Alan3354(69443)

Question 922913: Solve the equation for d when c = 0.
10c + 4d = 40
Click here to see answer by Fombitz(32388)

Question 922922: Solve the equation for d when c = 0.
-5d = 2c + 10
Click here to see answer by MathLover1(20849)

Question 922989: I need help with solving \\to y =1\5x-3
Thank you for considing my question
I tried to work the problem
Y=1\5x+3
Click here to see answer by Alan3354(69443)

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