Solve each proportion: 3/5 = 6/x+3 and 5/x-3 = 10/x
Answers
⇒ 6/x = 3/5 -3
⇒ 6/x = -2.4
⇒ x= 6/(-2.4)
⇒ x= -2.5
5/x -3 = 10/x
⇒ 5/x -10/x = 3
⇒ -5/x = 3
⇒ x= -5/3
Hope this helps~
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68 questions correctly on a 80 question test Express this amount as a fraction, percent, and decimal
b. Use expressions for the length and width to write an inequality for the
perimeter, on the basis of the given information.
c. Solve the inequality, clearly indicating the width of the rectangle.
Answers
Part A
w = width
L = length
L = w+8 since the length is 8 mm longer than the width
Answer: w+8
====================================================
Part B
P = perimeter of rectangle
P = 2*(L+W) = 2L + 2W
We want the perimeter to be more than 32 mm, so we want P to be greater than 32
This means we write P > 32
Replace P with either 2(L+W) or 2L+2W. I'll pick 2L+2W
So we go from
P > 32
to
2L+2W > 32
After this, replace L with W+8 (refer to part A above)
We now have
2(W+8) + 2W > 32
Answer: 2(w+8) + 2w > 32
====================================================
Part C
Let's solve the inequality found in part B to get...
2(w+8) + 2w > 32
2w + 16 + 2w > 32
4w + 16 > 32
4w + 16-16 > 32-16 ....... subtracting 16 from both sides
4w > 16
4w/4 > 16/4 ......... dividing both sides by 4
w > 4
Answer: w > 4; The width of the rectangle must be larger than 4 mm
Answers
Answer:
The number of hours each riders ride = 15 hours.
Step-by-step explanation:
19 riders = 11 days 21 hours to ride from St.Joseph to Sacramento
Let's find the number of hours taken.
1 day = 24 hours.
11 days = 11 times 24 = 264 hours
So, 11 days 21 hours = 264 + 21 = 285 hours
19 riders rode the same number of hours.
To find the each rider ride, we need to divide 285 by 19.
The number of hours each rider ride = hours.
Answers
Answers
If you know either the diameter of the circle or its radius,
then you're as good as done with the problem.
The formula for the area of a circle is
Area = (pi) x (radius²) .
The radius is 1/2 of the diameter.
π (the Greek letter for 'pi') is a slight problem. It's an "irrational"
number, and that means you can never write down its exact value.
As a decimal, it keeps going on and on forever, and as a fraction,
it can't be written at all.
So what are we supposed to do ? How can we ever write down the
exact value for the area of a circle ?
Using digits, we can't ! The only way to write the exact area
of a circle is to leave the letter π in the answer.
For example, if the radius of the circle is 5 ,
then the area is
Area = π R² = 25 π .
If you can only use digits to write the area, then you can never
write the exact number. Anything you write will always be
slightly wrong. BUT ... you can get very very close.
Technically, even though you can never be exactly correct,
you can get AS CLOSE as you want to. In books and online,
you can find π printed out with 1,000 decimal places, and the
more of them you use to calculate the area, the more accurate
your answer will be.
Here are the first 15 decimal places of π .
(These are the only ones I've memorized.)
3. 14159 26535 89793
At the end of 2009, a team got together and ran their computers for
131 days, and calculated π with 2,700,000,000,000 decimal places !
(It still doesn't end.)
So how many decimal places should you use ?
How close does the answer need to be for school ?
To answer that, I'm going to have to reveal the Big Secret
of school to you. Here it is. Please don't spread it around:
In school math, the answer doesn't matter !
The answer is not important, and nobody needs it.
Your teacher doesn't need the answer. If s/he did,
s/he could easily figure it out, and if s/he didn't know
how and had to ask somebody else, s/he certainly
wouldn't ask her students, because they're just now
learning how to do it.
What's important is knowing HOW TO FIND the answer.
The only reason they want to see your answers in
school math is: That's the fastest, easiest way to tell
whether you know HOW TO FIND the answer.
If you can invent a faster, easier way to tell whether
you know HOW TO FIND the answers, then nobody
will ever need to turn in the homework answers again.
I told you that, to tell you this: Your answer for the area doesn't need
to be very close at all. It only needs to be close enough to show that
you knew how to figure it out.
Most of the time in school math, the question will tell you
what number to use for π . Very often, it's 3.14 .
You would think that for a number that has trillions and trillions
of digits and goes on forever, that using only 2 decimal places
would not get you very close to the real answer.
You would be wrong.
-- If you use 3.14 for π , then the answer you get is too small,
but only by about 0.05 % .
-- If you use 3.142 for π , then the answer you get is too big,
but only by about 0.01 % .
-- If you don't like decimals at all, and want a fraction for π ,
then use 22/7 . Then the answer you get is too big again,
but only by about 0.04 % .
Any of these is way closer than you need to be for school math.
They're even closer than you usually need to be in real Engineering.
(Trust me. I know.)
______________________________________
Just one more thing:
About 36 days from today will be the day celebrated by
math people all over the world.
It's called "Pi Day" . It's on March 14th. ( 3-14 ) :-)
Net Monthly Income: $2,970.00
Expenses:
Housing: $750.00
Utilities: $120.00
Food: $450.00
Transportation: $650.00
Healthcare expenses: $200.00
Savings: $300.00
Other expenses: $500.00
Total Monthly Expenses: $2,970.00
15.2%
25.3%
45%
60%
Answers
Answer: Approximately 15.2% of Jerry's net monthly income is spent on food.
Step-by-step explanation:
We are given that Jerry's Net Monthly Income is $2970.
Out of this, his expenses are on Housing, Utilities, Food, Transportation, Healthcare Expenses, Savings, and Other Expenses.
To find the percentage of income spent on food, we note that the food related expenditure is given to be $450.
So, to calculate the percentage, we use the formula
(\frac{450}{2970}).(100)
that is, we divide the expenditure on food by the net income and multiply this by 100 to get the percentage.
Calculating the above expression, it works out to be 15.15% or 15.2% when rounding off the decimal.
Answers
Answer:
$1.75 more.
Step-by-step explanation:
Beef costs $4.25 per pound and purchasing 1.25 pounds.
Turkey costs $2.85 per pound and purchasing 1.25 pounds.
Beef = 4.25 x 1.25 = $5.3125
Turkey = 2.85 x 1.25 = $3.5625
5.3125 - 3.5625 = $1.75
Answer:
Step-by-step explanation: what is 12 in m over n form