# urgent math

posted by Connexus

1. Simplify the expression 7^9/7^3
a.7^3***
b.7^6
c.7^12
d.1^6
2. Simplify the expression z^8/z^12
a.z^20
b.z^4
c.1/z^-4
d.1/z^4
3. Simplify the expression (-3^4)/(-3^4
a.(-3)^1
b.0
c.1
d.(-3)^8
4.Which expressions can be rewritten as 1 over the base raised to a positive exponent? 2
a.b^-2/b^4
b.w^5/w^-3
c.5^3/5^5
d.4^7/4^7

1. Connexus

2.c?
3.c
4.a and d?

2. Steve

#1. 7^(9-3) = 7^6
NOT 7^(9/3) = 7^3
subtract exponents when dividing numbers. What you have is

7*7*7*7*7*7*7*7*7
------------------------
7*7*7

only three of the 7's cancel

#2
z^8/z^12 = 1/z^4 = z^-4
So, D, not C

#3 ok

#4 not sure what that trailing 2 means, but
a.b^-2/b^4 = (1/b^2)/b^4 = 1/b^6
b.w^5/w^-3 = w^5 * w^3 = w^8
c.5^3/5^5 = 1/5^2
d.4^7/4^7 = 4^0 = 1
Looks like A and C both work.

3. Connexus

Thank you so much steve

4. Connexus

could you help me with a few more questions?

5. Connexus

1. x^9/x^2
a.x^11
b.x^7***
c.7
d.x^5
2.h^14/h^5
a.h^-9***
b.1/h^9
c.h^19
d.h^9
3.4^4/4^6
a.-16
b.16
c.1/16***
d.-1/16
4.5^0
a.0***
b.5
c.1
d.-5
5.7^4/7^2_____49
a.<***
b.>
c.=
d. none of the above
6.-2r(8r+5)
a.-16r^2+5
b.-16r^2+10***
c.-16r^2-10r
d.-16r^2-10
7.2a(a^2+4a)
a.2a^2+6a^2
b.2a^3+8a^2
c.2a+6a
d.2a^3+6a^2***
8.(3y)(3y-2)
a.9y^2-6
b.9y^2+5y
c.9y^2+1***
d.9y^2-6y

6. kneegrow

100% thank you Steve

7. Martha

1.B
2.D
3.C
4.A and C
100%

8. aye

^^ THANK YOU SO MUCH MARTHA I GOT 100%

9. Zurai

steve is right i got a 100%

1. B
2. D
3. C
4. A and C

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