Answer:
Step-by-step explanation:
add the whole numbers
combine the fractions
LCM is 35 because 7 * 5 =35
change the improper fraction into mixed number
D is .001. C is 1/1000.
To find b you have to do 5/6=x/100 and once you find that you can find a by moving the decimal over to the left two times
Answer,
<em>(26/2) * 3</em>
<em>= 39</em>
Explanation,
<u><em>26 cookies is only 2/3 of 3/3. So, we divide 26 by 2 to see how many cookies are in 1/3. We then can find out that when you make 1/3 of the cookies there are 13. Since that is only 1/3 and we want to find out 3/3. We multiply 13 by 3 and get 39 which is all the cookies she planned to make.</em></u>
<u><em>Hope this helps :-)</em></u>
Answer:
The solution is ( 1/2 , 5)
Step-by-step explanation:
∵ 8x + 7y = 39 ⇒ (1)
∵ 4x - 14y = -68 ⇒ (2)
Multiply (1) by 2
16x + 14y = 78 ⇒ (3)
Add (2) and (3)
∴ 20x = 10 ⇒ x = 10 ÷ 20 = 1/2
∴ x = 1/2
By substitute in (1)
8(1/2) + 7y = 39 ⇒ 7y = 39 - 4 = 35 ⇒ y = 35 ÷ 7 = 5
∴ y = 5
∴ The solution is ( 1/2 , 5)
To check:
8(1/2) + 7(5) = 4 + 35 = 39 = R.H.S
4(1/2) - 14(5) = 2 - 70 = -68 = R.H.S
In the first problem, the student is trying to find the solution of the two equations
so the student should use both equations
what the student did was only use the 2nd equation twice (if you use the same equation there are infinite solutions) when he/she should have used both equations
for the 2nd problem
trashaway=0.25x+25 where x=number of pounds
garbagenomore=45
solve where they intersect or where they are equal
45=0.25x+25
20=0.25x
80=x
80lb
