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2 angles that add up to equal 180 degrees

---can be any two angles 179+1=180, 90+90=180, 80+100=180

1 and 46 are also factors

Converting 3/8 (or any fraction) into a percentage is a two-step process.  First, calculate the "decimal equivalent" of 3/8.  Second, multiply the decimal equivalent by 100 to convert to the percentage value.

3 ÷ 8 = 0.375

0.375 × 100 = 37.5%

We have

80 - (-35)

Remember that a negative outside parentheses or brackets changes the sign of everything inside....so we have

80 + 35 = 115

Bill Ding constructs quality homes. He figures that a house built on a particular lot should be sold for 373,000 if it has a floor space of 3000 square feet. A 4000 square foot house constructed on the same lot should be sold for 483000. The selling price is the sum of the construction cost, at a fixed number of dollars per square foot, and the cost of the lot. Figure out the number of dollars per square foot it costs to construct the house, and the cost of the lot

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OK.....we just need a linear equation here...I'm going to represent these numbers in thousands just to simplify the process. Let square feet be the"x" variable and total cost be the "y" variable.

So we have the points (3, 373) and (4, 483)....to write a linear equation, we need to find the slope of our line.  We have

(483 - 373) / (4 - 3) = 110   (This actually is the cost per sq ft = $110)

So, using a point and the slope we have.....

y - 373 = 110 (x - 3)

y = 110x + 43  or

y = 110x + 43000

So, the lot cost must just be $43000

Chek this with the $483000 house...

y = 110(4000) + 43000

y = $483000

P.S.....I like the "Bill Ding" thing !!!

what is sin7? and how do you do it

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We have to be careful, here. Without the "degree" symbol, this means .....finding the sine of an angle with a measure of 7 rads !!! This (in degrees) is about

$${\frac{{\mathtt{7}}{\mathtt{\,\times\,}}\left({\mathtt{180}}\right)}{{\mathtt{\pi}}}} = {\mathtt{401.070\: \!456\: \!591\: \!576\: \!246\: \!1}}$$   

Thus, sin(7) = 0.656986598719

But, sin(7°) = 0.121869343405

See the difference....???

Re: what is 3.2*10 to the negative 7th

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I'm assuming that you have something in scientific notation like this......

3.2 X 10^-7 ....     this tells us to move the decimal 7 places to the left  ..  so we have

.00000032

And that's it !!!

Re: What is the height of a rectangle with a perimeter of 216 mm and a base length of 44 mm?

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Let's look at this one again....

Perimeter = 2(B + H)  Substituting, we have

216 = 2(H + 44)  divide by 2 on each side

108 = H + 44   subtract 44 from both sides

108 - 44 = H

H = 64 cm

a '95 Ford Escort engine delivers a whopping 83.6 hp of power (go Speed Racer!), how much time will it take for the engine to do 5.69 multiplied by 105 J of work?

(Hint: Note that one horsepower, 1 hp, is equal to 746 watts.)

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First note this:

A horsepower is a term used for power, and is a rate of energy used/produced in a unit of time (energy/unit time).

A Joule (J) is a term for energy, and is a quantity of energy equal to a watt-second. Its rate form is 1 joule per second equals 1 watt (1J/s = 1w) and 1 watt-second = 1 Joule (1Ws =1 J).

To solve this, convert horsepower to watts (power), then watts to joules per second (power), then divide the rate (power) by the requested amount of work (energy) and this will yield the time required (at that rate).

The default unit of time for power is 1 hour (3600 seconds).

83.6 hp * (746w/1hp) = 62365.6w (power)

62365.6w / (1 J/s) = 62365.6 J/s (power)

5.69 * 105J = 597.45J (energy, from question)

(597.45J) / (62365.6 J/s) = 0.009572s or 9.572ms (amount of time required)

(Note. Corrected error: original solution was inverted-- that means WRONG!).

~~D~~

HELP ME! h=at-0.25vt^2, solve for a!

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OK    So we have

h = at -.25vt²    Here's the easiest war to do this...add .25vt² to each side

h + .25vt² = at    Now, divide by t    This gives

(h + .25vt²) / t   = a

And that's it !!  Not too bad, huh??

say there are 5 coins in a bag. 3 are red and 2 are blue. To find the probability of finding a red, you must do 3/5. probability is favorable outcomes divided by all possible.

it is about .12. you have to uise a calculator to find it

about 6.13

3*17*45/22*446/77*10+2

51*45/22*446/77*10+2

51*2.05*5.79*10+2

104.55*5.79*10+2

605.34*10+2

6053.4+2

6055.45

Do 216 divided by 44.

37.5% 

First, convert the fraction 3/8 so that the 8 becomes 100. Always do that when you're trying to convert fractions into percentages. You do that by multiplying the 3 and the 8 by 12.5 (the way I found out the number 12.5 was by doing 100 divided by 8. Just do 100 divided by the bottom number, and then multiply the bottom and the top by that number). So then you get 37.5/100. Then it's easy to find out the percentage from there. Hope that made sense!

38% rounded exact is 37.5%

10,216.8

1,241,100,000,050 digits (decimal places).

We all want Cphil (brother of Sisyphus) to list them. You have to type them (no copy and paste). We want it by tomorrow!!!

If you make a mistake you have to start over and write them by hand in roman nurmerals!

From, and by order of, Zeus

i don't know

(x-4)6 = (x+2)5

6x-24 = 5x+10

6x-34 = 5x

x-34 = 0

x =34

First, you will have 2 points on a graph. Let's say that the points are (4,-2) and (13, 6).

You would subtract the y coordiantes first. 6-(-2) is 8.

Then you would do the same for x. 13-4 is 9.

Y goes over X is slopes, so the asnwer would be 8 over 9.

Well, a square is a four sided figure with equal side lengths and angles.

A number squared is that number multiplied by itself.

Ex: 2 squared is 4, 8 squared is 64

I LOVE THAT SONG!

Tanny Book Oooooo

Tanny was a Book OOOO-ooooooohhhh

That song is so catchy.

Because f(x) is not a 1 to 1 mapping the inverse doesn't exist unless you restrict the domain of x.

if you restrict x to {x:x >= 7} you could find

$$y=x^2+7$$

$$y-7=x^2$$

$$x=\sqrt{y-7}$$

$$f^{-1}(x)=\sqrt{x-7}$$

on the other hand if you restrict x to {x: x <= -7} you get

$$f^{-1}(x)=\sqrt{7-x}$$