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The teachers have super vampire sort of powers, instead of draining blood, they drain your will to live, your strength, and then at the end of the lesson they give some back so you can move on to the next lesson. Happy?

Use Bidmas

Brackets 

Indicies 

Division

Multiplication

Addition

Subtraction

Decrease = Original Number - New Number

Decrease = 95 - 75.8 = 19.2

% Decrease = Decrease ÷ Original Number × 100
% Decrease = (19.2/95) * 100 = 20.21%

so about a 20.21% reduction.

 ([ 95 - 75.8] / 95  * 100 ) %   = about a 20.2% reduction

YES ITS 0.5 OR JUST .5

Thank you :)

If I understand you correctly, you want to change a positive number to a negative number.  There are several ways to do this.  You can add, subtract, multiply, divide, or take the negetive positive nth root of the positive number to change the positive number to a negetive number.

To change a positive number to a negetive number by adding:

Take a positive number and add a negetive number whose absolute value is greater than the absolute value of the positive number to get an answer of a negetive number.

\(5+(-6)=-1\)

To change a positive number to a negetive number by subtraction:

Take a positive number and subtract a positive number whose absolute value is greater than the absolute value of the first positive number to get an answer of a negative number.

\(5-6=-1\)

To change a positive number to a negative number by multiplication:

Take a positive number and multiply any negetive number to get an answer of a negetive number.

\(5\times(-6)=-30\)

To change a positive number to a negative number by division:

Take a positive number and divide any negetive number to get an answer of a negetive number.

\(5÷(-6)=-0.8333333333...\)

To change a positive number to a negative number by taking the negetive positive nth root of the positive number:

Take the positive number and take the positive nth root of the number then put the negetive sign in front of the positive number.

\(-\sqrt{4}=-2\)

CD......the area of this obtuse triangle works just like any other....A  = (1/2)bh

So

A =  (1/2)(4.4cm) (2cm)  =   4.4cm^2

First, let's  find the length of GH  using the Law of Cosines

GH^2 =  11^2 +  9^2  - 2(11)(9)cos(65)

GH = sqrt ( 11^2 +  9^2  - 2(11)(9)cos(65))  = about 10.97

Now, using the Law of Sines, we have

SinG/HF = sinF/GH

SinG/ 9  = sin(65) / 10.88

sinG  = 9*sin(65)/ 10.88

arcsin [ 9*sin(65)/ 10.88 ]  = G  = about  48.6°

Problem \(\frac{1}{2}\)

To convert a fraction into a deimal, think of the fraction as division problem, \(1÷2\), and simplify the division problem.

Answer: \(0.5\)

Jordans...gotta problem?

15 1/2.

0.5

Very nice work to all involved, here !!!!

Solve for x:
2/25 x (x+8) = 4

Multiply both sides by 25/2:
x (x+8) = 50

Expand out terms of the left hand side:
x^2+8 x = 50

Add 16 to both sides:
x^2+8 x+16 = 66

Write the left hand side as a square:
(x+4)^2 = 66

Take the square root of both sides:
x+4 = sqrt(66) or x+4 = -sqrt(66)

Subtract 4 from both sides:
x = sqrt(66)-4 or x+4 = -sqrt(66)

Subtract 4 from both sides:
Answer: |  x = sqrt(66)-4     or       x = -4-sqrt(66)

What the H**l shut up!!!!

It has only "complex" solution:

Solve for x:
4 x^2+8 x+23 = 0

Divide both sides by 4:
x^2+2 x+23/4 = 0

Subtract 23/4 from both sides:
x^2+2 x = -23/4

Add 1 to both sides:
x^2+2 x+1 = -19/4

Write the left hand side as a square:
(x+1)^2 = -19/4

Take the square root of both sides:
x+1 = (i sqrt(19))/2 or x+1 = 1/2 (-i) sqrt(19)

Subtract 1 from both sides:
x = (i sqrt(19))/2-1 or x+1 = 1/2 (-i) sqrt(19)

Subtract 1 from both sides:
Answer: |  x = (i sqrt(19))/2-1           or         x = 1/2 (-i) sqrt(19)-1

It is a big mystery!!.

Simplify the following:
2+3/4+12+6/8

The gcd of 6 and 8 is 2, so 6/8 = (2×3)/(2×4) = 2/2×3/4 = 3/4:
2+3/4+12+3/4

Put 2+3/4+12+3/4 over the common denominator 4. 2+3/4+12+3/4  =  (4×2)/4+3/4+(4×12)/4+3/4:
(4×2)/4+3/4+(4×12)/4+3/4

4×2  =  8:
8/4+3/4+(4×12)/4+3/4

4×12  =  48:
8/4+3/4+48/4+3/4

8/4+3/4+48/4+3/4  =  (8+3+48+3)/4:
(8+3+48+3)/4
Answer=62/4=31/2=15 1/2