The Big Test
Here is one question from the test. You may bring the answer written out on looseleaf to the test tomorrow afternoon. You must write your explanation using complete sentences. You may also show equations to help in the description. DO NOT just solve the equation. You are not required to answer this question ahead of time. Consider any advantage(s) to doing so.
Question #8. Describe in words the steps you would use to solve the following equation:
7 = x/3 - 4/3
Homework:
Chapter 3 Self Test...Be sure to check your answers. We will use tomorrow morning's class to review/practice.
16 comments:
I just checked my answers for the PST, and I think the answer for #9 in the back of the book is incorrect. Part of the question states that "the grand prize was twice the value of the other prizes combined". The back of the book says to use x+x+x+2x=3500 as your formula, with 2x equaling the grand prize, but doesn't the equation say that the grand prize is twice the other prizes seperate, not combined?
anyone else see this, or am I just looking at this the wrong way?
I dont understand this extra credit question
o'reilly,
the question says the GRAND PRIZE winner gets 2 times the other prizes combined. So, instead of x+x+x+2x=3,500, you should get...
Let P= prize money.
p+p+p+ 2(3p)
This is because you have the three separate prizes and then the grand prize is twice as much as the 3 prizes combined.
Hope I helped.
♥gabs16
I did the PST and understood everything, just I just have problems checking fraction like for 3 on the PST. Note that there probably won't be any school tomorrow, so I think the test will be on Friday.
DO YOU GUYS SEE HOW MUCH SNOW IS OUTSIDE???
I MEAN MAYBE ITS JUST OUT HERE BUT THERE IS AROUND 4-5 INCHES LAST TIME I MEASURED!!!!
THAT CALLS FOR AT LEAST A 2 HOUR DELAY RIGHT????
WEAR YOUR PJ'S INSIDE OUT AND BACKWARDS AND DO ALL THOSE CRAZY OTHER THIGNS PEOPLE DO TO MAKE IT SNOW. (BRIAN AND I FLUSH ICECUBES DOWN THE TOILET AND IT WORKS MOST OF THE TIME.)
<3 JEN12 <3
OHH...BTW I FINISHED THE PST WASN'T SUPER HARD EITHER I ONLY HAD A PROBLEM UNDERSTANDING #9 FOR THE SAME REASON AS OREILLY.
I just finished the PST and had the same problem as o'reilly on 9. I used the same expression gabs16 used, P=x+x+x+2(3x)=3,500, and I agree that the answer key must be wrong, because it does not say twice as much as one of the prizes, but twice as much as the three prizes combined.
I also had difficulty checking #3. I got the right answer, 109/7=f, but I had a difficult time checking my solution:
CHECK: let f=109/7
101=13f-2(4+3f)
101=13(107/9)-2(4+3(109/7))
101=13(107/9)-(8+(327/7)
101=13(107/9)+(-8)+(327/7)
63(101)=63(13(107/9)+(-56)+(327/7)
6363=819(749)+(-3528)+2943
6363=613431+(-585)
6363=612846 ?????
Could someone please help me by explaining what I'm doing wrong and if multiplying by 63 is the most efficient way to check this problem?
Also, Mrs. Burke, on the test tomorrow will we need to know how to solve inequalities on a CAS calculator?
Please help me!
Hope for a snow day!
No, you will not have to know how to do the problem using CAS.
If I understand correctly o'reilly's question on #9, I would have to agree with gabs16 on how to set up the equation. The word "combined" means to add the value of the three prizes together.
I do not have my book with me to check but that will be the first thing I do tomorrow morning.
Hey mmv<3 I think I know what you did wrong. When you reach the step
101=13(107/9)-2(4+3(109/7))
you did not apply the ditributive propery on the 3 only the 4.
Hope that helps you solve it
To Mrs. Burke and gabs16:
I thought that P=the total prize money, meaning the small prizes + the grand prize. The equation I used is 2(3,500/3)=G, when G equals the grand prize. I think this is correct because one third of all the money are the small prizes, and because the grand prize is twice as much as the smaller prizes COMBINED, the grand prize is two-thirds.
thanks gluca! that helps a lot! And thanks Mrs. Burke, the CAS stuff really confuses me!
MMV<3, I think your problem is in the third step, you multiply 2 times 4 first, instead of 4 + (327/7). Check that and see if you get the right answer.
Yeah what gluca said, only 4 minutes too late.
hey guys
MMV<3
i combined the like terms before substituting the vsriable. I only did this because I had the same problem. Here's what I did:
101=13f-2(4+3f)
101=13f+-2(4+3f)
101=13f+-8+-6f
101=7f-8
then I substituted and got:
101=7(109/7)-8
101=109-8
101=101
o'reilly~
for this problem I understood it as P=x+x+x+2(3x)but looking back on it i think you had the answer correct because I am confused whether when it says TOGETHER THE PRIZES' VALUE IS $3500 it means the prizes and the grand prize or just the three prizes which in that case i woul think that the equation would be to solve for x or 3x=3500
x=1166 2/3
GRAND PRIZE EQUATION
(3x)2 let x = 1166 2/3
3500 x 2
7000
the grand prize is worh 7000 dollars.
Ireally don't know from what I have read from all of you guys is that there coulsd be many options and I might be wrong but that's how I interpretted this problem.
WHICH IS RIGHT????????????????????
***********************************
<3 JEN12 <3
I have the same question as mmv<3 but I'll just ask tomorrow because the fractions messed my check up
I also do not really understand one of the operations in the extra credit
sjb, part of the challenge in the extra credit is trying to figure out what the symbol means. I gave you the definition. You just need to apply the definition to the individual problems.
Post a Comment