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what is 25/-1 as a decimal?

25 / (-1) =-25 It is already as a decimal. Decimal means "based on 10". So 25 is: 2 x 10 + 5 =25.

3.16 x 10^(-23)  x  10^9   =   3.16 x 10^(-23+9)  =  3.16 x 10^(-14)

How to express 0.3% in fraction?

.3% means =.3 / 100 =0.003

0.003 x 1,000/1,000 =3/1,000 as a fraction.

whats the unit rate of $91 in 14 h

$91.00 / 14h =$6.50 per hour.

Solve for x:
-(16 x^2)/1225+(7 x)/5+2.5 = 0

-(16 x^2)/1225+(7 x)/5+2.5 = -(16 x^2)/1225+(7 x)/5+5/2:
-(16 x^2)/1225+(7 x)/5+5/2 = 0

Multiply both sides by -1225/16:
x^2-(1715 x)/16-6125/32 = 0

Add 6125/32 to both sides:
x^2-(1715 x)/16 = 6125/32

Add 2941225/1024 to both sides:
x^2-(1715 x)/16+2941225/1024 = 3137225/1024

Write the left hand side as a square:
(x-1715/32)^2 = 3137225/1024

Take the square root of both sides:
x-1715/32 = (35 sqrt(2561))/32 or x-1715/32 = -(35 sqrt(2561))/32

Add 1715/32 to both sides:
x = 1715/32+(35 sqrt(2561))/32 or x-1715/32 = -(35 sqrt(2561))/32

Add 1715/32 to both sides:
Answer: |x = 1715/32+(35 sqrt(2561))/32      or      x = 1715/32-(35 sqrt(2561))/32

A useful collection of formulae Omi.  There is a similarly useful collection on the English language Wikipedia site: https://en.m.wikipedia.org/wiki/List_of_trigonometric_identities 

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When john left he had 120 cards :)

Area of Circle=Pi x r^2. r=radius

Find the area of the larger circle and then the area of the smaller circle. Then subtract the smaller area from the larger one. That should give you the shaded area(even though we can't see a picture of it!).

semi anual payment 500 php at the end each term for 10 years with interest rate of 5% compounded sime anualy.

So, what is the question? You have 20 semi-annual payments @ 5% comp. semi-annually.

If you want their PV(present value), then you have:

PV=P{[1 + R]^N - 1.[1 + R]^-N} R^-1=PV OF $1 PER PERIOD.

PV=500{[1 + 0.05/2]^10*2 - 1 x [1 + 0.05/2]^-10*2 x (0.05/2)^-1}

PV=7,794.58 php

If you want their FV(future value), then we have:

FV=P{[1 + R]^N - 1/ R}=FV OF $1 PER PERIOD.

FV=500 {[1 + 0.05/2]^10*2 - 1 / 0.05/2}

FV=12,772.33 php

130

Like this?

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decrease 420 by 7%

Baking percentage = 1.5*100/4 →  37.5%

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F = number of five dollar notes.  T = number of two dollar notes

5F + 2T = 420          (1)

T = F       (2)

Use (2) in (1)

5F + 2F = 420

7F = 420

F = 60

There were 60 five dollar notes (and the same number of two dollar notes).

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You don't have a deviation with a sample of 1!!!

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This factors as (3cos(w) - 1)(2cos(w) + 1) = 0

so cos(w) = 1/3  or  cos(w) = -1/2

cos(w) = 1/3 ⇒  w = 70.529° or w = 289.471°

cos(w) = -1/2 ⇒   w = 120°  or w = 240°

You have the calculator set in degree mode if you get the 1.047... result.

Set in radian mode it gives the following:

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To go from the third last line to the second last line is just dividing both sides by the same thing.

Have I misunderstood your question?

There's no equation/graph

≈1310.91

As far as restriction for x, there are none.