Need help with maths (make x the subject)?

Question

Have been given a few questions to do and am battling to find the answers. I don't know how to complete them and really want to get good marks so I don't get put in a lower grade class. Any help is apreciated

1. Given:

E=1/2mv^2

make m the subject

2. Given:

A=4(pi)r^2

make r the subject

3. Given:

E=3/4(pi)r^3

make r the subject

4. Given:

5Ar=4(pi)r + 12

make r the subject

5. Given:

v=u + at

make t the subject

(believe {t = v / u + a} is the answer)

Thanks in advance

Answer 1

I won't give you the answers, but all you need to do is move everything to the other side of the = by making it the opposite.

+ becomes -

- becomes +

x becomes /

/ becomes x

^ becomes Square root (and vice versa)

mover each letter/number until your left with the one you need to make the subject on it's own on one side of the = and everything else on the other

Answer 2

1)2E=mv^2  m=  2E/(v^2)

2)A/4=(pie)r^2    = A/4pie=r^2     = r=square root of(A/4pie)

3)4E/3=pier^3      = 4E/(3pie)=r^3         = r=cube root of     4E/(3pie)

4)5Ar-12=4(pie)r    = (5Ar-12)/4=(pie)r     r=(5Ar-12)/4pie

5)t=v-u/a     seems u almost figgured it out cleanly.

Answer 3

1) E= 1/2 MV ^ 2

5) T= V-U/A

others, do it you help

looking at the two above

Answer 4

2E/v^2 = m

r = root (A/4pi)

r = cube root (4E/3pi)

r = 12/(5A - 4pi)

t = (v - u)/a

Answer 5

do it yourself, not too difficult.i think you need to do the chapter again!