Algebra

1.What is the simplified form of the following expression?
13[6^2�€(5^2-4^2)+9]

A.169
B.585***
C.181
D.26

2.What is the simplified form of the expression?
6xyz/2xz

A.3
B.3y
C.3xyz***
D.3x^2yz^2

3.In a football game. A running back ran for -7 and -5 on his last two runs. His total yardage for the whole game is 78 yards. Which expression shows how many yards the running back had before those two runs.

A.78-5-7***
B.78-5+7
C.78+5-7
D.78+5+7

4.Which is the value of X/yz if x=-2, y=-3 and z=-4?

A.6
B.-6
C.1/6
D.-1/6***

5.Which statement about the product is true?
4.56 x 4.5

A.The product is rational***
B.The product is irrational
C.The product is neither rational or irrational
D.The nature of the product can not be determined

6.Which of the following results in a sum or product that is rational choose all that apply.

A.ƒÎx6***
B.�ã3+�ã5***
C.4+6
D.3.15 x 4.6***
E.�ã64 x �ã25

7.Molli purchased 9 apples for $3.96. While looking for her receipt ,Molli divided $3.96 by 9. Why might Molli preform this calculation?

A.In order to find out how much she paid per apple***
B.In order to find out the total number of apples purchased
C.In order to calculate the total amount that she owes
D.In order to calculate how much money she has left

The ones with (***) next to them are what I think the answer is. I've been stuck on these 7 problems for 3 days now and it's my last day to turn it in. I've tried my best to answer the problems so can you please help correct my mistakes and tell me how you got your answer so next time I wont have to struggle on these problems again. Thank you.

(I know I have a lot of problems wrong but this is why I posted them,so someone would help correct my mistakes.)

So Please Help Me,Im Very Much In Need Of It.

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  1. #1 well, 13[6^2+9]=585
    so if you are right, I have no idea what the €(5^2-4^2) means

    #2 B
    You correctly dived 6 by 2, so why not also cancel the xz in both top and bottom?

    #3 D
    He ended up with 78 after two losses, so you mustn't subtract them again. You need to cancel them out to see where he started. Addition and subtraction are inverse operations, so to cancel the losses, you must make them gains.

    #4 D correct
    #5 A correct

    #6 CDE
    No idea what A means, but I suspect it's some sort of root operator
    Any terminating decimal is rational (as in #5), and since √64=8 and √25=5, their sum is also rational.

    #7 A correct

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  2. I'm sorry. I had to use my laptop to type all of this and yes #1 was suppose to be 13[6^2�(5^2-4^2)+9] sorry, so was #1 the answer I assumed was wrong? how about A that was my first guess but I calculated it and it led me somewhere near B.585 so am I correct now or no?

    So you mean for #2 take the xz out and keep the y which the answer would be B.3y if I do so. so is that answer correct or no must I look and try harder?

    for #3 I figures it would be 78-5-7 because they was both negative numbers and it said how many runs would the runner back have before the too runs so I thought subtracting would be it but now I think it's D.78+5+7 because it said before he had the two runs and the two runs he had a negative so if its positive he'd have his total runs back because the negatives only reduced his number of runs. (I'm not sure if I explained this right but is my new answer correct or shall I relook)

    and with #6 A was suppose to be Pi(3.14). I didn't have it on my laptop so I had to copy and paste it but I guess it turned out bad and I got that answer because pi is 3.14 and I guess any thing with a decimal or so is rational right?

    Thank you very much for helping me. I hope to get a better understanding but before you go to answer other questions is my new answers correct for the one's that got messed up or wrong correct now?

    1.What is the simplified form of the following expression?
    13[6^2�(5^2-4^2)+9]

    A.169***
    B.585
    C.181
    D.26

    2.What is the simplified form of the expression?
    6xyz/2xz

    A.3
    B.3y***
    C.3xyz
    D.3x^2yz^2

    3.In a football game. A running back ran for -7 and -5 on his last two runs. His total yardage for the whole game is 78 yards. Which expression shows how many yards the running back had before those two runs.

    A.78-5-7
    B.78-5+7
    C.78+5-7
    D.78+5+7***

    6.Which of the following results in a sum or product that is rational choose all that apply.

    A. pi x 6***
    B.� square root 3+�square root 5***
    C.4+6
    D.3.15 x 4.6***
    E.� square root 64 x �square root 25

    but once again thank you Steve

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  3. #1 I finally figured how you got 169. Your strange symbol must have been this:

    13[6^2÷5^2-4^2)+9] is indeed 169

    which got garbled in my fonts. Try using / for division, as in 2/3.

    2B
    3D

    4. Stop using x for times. Use * online, where x is usually used as a variable. Use pi if you can't enter π.

    π*6 is irrational
    √3 + √5 is irrational
    4+6 is rational
    3.15*4.6 is rational
    π*4.6 is irrational
    √64+√25 = 8+5 is rational

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