The best unit for measuring the width of a textbook would be

1 answer:

4 0

The best unit for measuring the width of a textbook would be centimeters.
A millimeter is a very small unit, so there would be no point in measuring width. Meters is too long. Decameters is still too long, so centimeters would be perfect.

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The length of a rectangle is eight feet more than its width. The area of the rectangle is six hundred nine square feet. What are

vodomira [7]

You can write two equations using the given information:
.. L = W +8
.. L * W = 609
Using substitution, you get a quadratic.
.. (W +8) * W = 609
.. W^2 +8W -609 = 0
Not surprisingly, you're looking for factors of 609 that differ by 8.
.. 609 = 1*609 = 3*203 = 7*87 = 21*29
The last two are the factors of interest.
.. (W +29)(W -21) = 0

The width of the rectangle is 21 feet, the length is 29 feet.

_____
Sometimes it is easier to work with the average dimension. Here, let that be x. Then you have
.. (x +4)(x -4) = 609
.. x^2 -16 = 609
.. x^2 = 625 = 25^2 . . . . . . . one of your memorized math facts
So, the dimensions are
.. 25 +4 = 29 by 25 -4 = 21, that is, 29 ft by 21 ft.

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2 years ago

Find the slope of the line. (Image) A. 1/2 B. -1/2 C. -2 D.2

ASHA 777 [7]

The answer would be B. -1/2

8 0

2 years ago

. How are the formulas for the circumference of a circle and area of a circle derived?

kakasveta [241]

They can be derived by using calculus(integration to be precise)

$\pi$ $= \frac{circumference }{diameter}$ (its how pi is defined)
so that gives circumference

to get area , you use integration $of an elemental ring of radius r and thickness dr and integrate it$ $A= \int\limits^0_r {2 \pi r} \, dr$

that gives the area.

if you don't know calculus yet ,dont worry, just remember the formulae.

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3 years ago

A line that passes through the point (1, –1) and parallel to another line whose slope is 1.

Mars2501 [29]

Parallel lines have same slope so so far the new equation looks like this
$y = 1x + b \\ y = mx + b$
now you plug in you points or coordinates to find b or solve for the y-intercept
$- 1 = 1(1) + b$
$- 1 = 1 + b$
$- 1 = 1 + b \\ - 1 = - 1$
$- 2 = b$
now that you have your b your final solution is
$y = 1x - 2 \: or \: y = x - 2$

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3 years ago

kelly use 6 cups of apples, 4 cups of oranges, and 2 cups of grapes to make a fruit salad. She put an equal amount in each of 6

erastova [34]

2 cups in each bowls

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3 years ago

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