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Maths Help Needed :(

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Tohru Kyo Sohma:
Solve the equation x(x-12)=-20. the sum of the 2 solution is?
a. 10
b. 12
c. 14
d. 8
e. -8

I think its B

Tohru Kyo Sohma:
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?

Tohru Kyo Sohma:
Pls help me out
I have my exam within 10 hours

f 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

astarmathsandphysics:
You can canel thoughout by 2 for example (4+6)/4=(2+3)/2

astarmathsandphysics:
the first three questions answered in attachment

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