Alan

This question doesn't make sense as it stands.  Further information is needed.

To convert from degrees to radians multiply by pi/180

\(101° = 101*\frac{\pi}{180}\rightarrow1.7628 \text{ radians}\)

Just enter this into the calculator on the home page here:  http://web2.0calc.com/ 

No!  Look at the number line:

See http://web2.0calc.com/questions/if-64-15g-of-hcl-were-produced-from-2-07g-of-h-2-and-an-excess-of-cl-2-according-to-the-rreaction 

If you didn't understand the answer given there it 's best to say so in that thread,  Better not to start another thread.

...

\(1+\frac{A}{B}\text{ can be written as }\frac{B+A}{B}\text{ so it's reciprocal can be written as }\frac{B}{B+A}\)

Division by zero is undefined in mathematics.

Hooke'slaw says the force required is proportional to the extension, where the proportionality constant is the spring constant.  So here (knowing that the force is mass*gravitational acceleration) we have:

10*9.81 = 70*extension

extension = 9.81/7 m ≈ 1.4 m

This is

15 - 6x = -12 + 6x -10x

15 - 6x = -12 -4x   

Add 6x to both sides

15 = -12 + 2x

Add 12 to both sides

27 = 2x

Divide both sides by 2

13.5 = x

(or just x = 13.5)

.

This is a perennial question!

(-8)^2 = 64

-(8^2) = - 64

Since raising to a power is generally taken to be of higher priority than negation, the expression -8^2 is interpreted as -(8^2) by most pieces of technical software.  Hence -8^2 = -64.