Maths Placement test Urgent Help needed

[mimiswift]

1. How many solutions has the system 2x-3y=5 2/3x=y+5/3
a. None
b. exactly one
c. exactly two
d. infinitely many
e. none of the above

I have no idea how to do it?

2.How many solutions has the system 2x-3y=5 2/3x=y+5/3
a. None
b. exactly one
c. exactly two
d. infinitely many
e. none of the above

I have no idea how to do it?
what do you think?

3.
(3A-4B)^2=
a. 3a^2-4b^2
b. 9a^2-16b^2
c. 9a^2+24ab-16b^2
d. 9a^2+24ab+16b^2
e. none of the above

I think its E
i got my answer as 9A^2-24AB+16B^2

Pls help me out tonight
My test is tomorrow?

 

[mimiswift]

Q. If 9^x-2y =81 then 4y-2x =
a.1
b.3
c.-4
d.4
e. none of the above
I think its C? Am i right?

Q. If f(x)-3x^2 -1 then f(h+1)=
a. 3h^2+6h+4
b. -3h^2+6h-4
c. -3h^2-6h -4
d. -3h^2
e. none of the above

Q. (x^-3 x^2 / x^5)^2/3 equals to
a. x^4
b. 1/x^4
c. 1/x^3
d. x^3
e. none of the above

Q. If p^2=1 and q^2=9. Then the smallest values of p-q is
a. -4
b. 8
c. -10
d. 4
2. None of the above

Q. 5/9x^2 +1/6x =1
a. 10+3x/18x
b. 10+3x /9x
c. 10+3x/18x^2
d. 10+3x/9x^2
e. none of the above

Q. 2/x +3/2x -4/4x=
a. -24/8x^3
b. 24/8x^3
c. 1/7x
e. 9/7x
e. none of the above

I have my exam within 10 hours
Pls help me out!