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leva [86]
3 years ago
11

A new sidewalk will be 4 feet​ wide, 240 feet​ long, and filled to a depth of 9 inches ​(0.75 ​foot) with concrete. How many cub

ic yards of concrete are​ needed?
Mathematics
1 answer:
Drupady [299]3 years ago
3 0

Answer: The number of cubic yards of concrete that are needed is 720.

Step-by-step explanation: The same formula for this type of shape stays the same: l*w*(h or d).

240 * 4 = 960

960 * 0.75 = 720

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What is the Point slope equation
anastassius [24]

Answer:

y - y1 = m(x - x1)

Step-by-step explanation:

The point slope form equation is [ y - y1 = m(x - x1) ]

(x1, y1) is any given point on the line.

m is the slope.

To solve this you would need these things:

  • Slope (y2-y1/x2-x1)
  • Y-intercept (y = mx + b)

Best of Luck!

3 0
3 years ago
The hypotenuse of a right triangle is three times the length of one of its legs. The length of the other leg is four feet. Find
andre [41]

Hello!

It is given information that this triangle is a right triangle, meaning that the Pythagorean Theorem can apply here.

a^2+b^2=c^2

We can set the length of a leg as an unknown variable x.

x^2+4^2=(3x)^2

Remember that it is the whole 3x term being squared, meaning that it'll simplify to 9x^2, not 3x^2.

x^2+16=9x^2

8x^2=16

x^2=2

x=\sqrt{2}

This means we can plug back in to find the sides.

The hypotenuse would be 3\sqrt{2}, or 4.2.

And the legs would be 1.4 and 4, respectively.

Hope this helps!

7 0
2 years ago
Find the Area of the figure below, composed of a rectangle with two semicircles removed. Round to the nearest tenths place.
Allisa [31]

Answer:

21.8

Step-by-step explanation:

hii so basically first we find the area of the 9 by 8 and subtract the area of the semicircles.

area of circles are πr^2, so in this situation

π4^2 which is 16π.

with this, the semicircle which is half a circle would give us

16π/2 which is 8π.

but then, we have two semicircles removed so we would have as an answer:

(9*8)-8π+8π

72-16π

then you would have to round so

16π is around 50.2

so 72-50.2 is 21.8

i hope this helped you <33

6 0
3 years ago
Find the circumference of a circle with radius 10.3 feet . Round your answer to two decimal places.
patriot [66]

C= 2πr

r= 10.3ft

π= 22/7

C= 2×22/7 × 10.3

C= 64.74 feet

5 0
3 years ago
Read 2 more answers
The weekly demand for DVDs manufactured by a certain media corporation is given by
djverab [1.8K]
Let <span>the production level that will yield a maximum profit for the manufacturer be x.
</span>The unit price of the disc is given by p = -0.0006x^2 + 65.
The revenue from selling x discs (R(x)) = px = -0.0006x^3 + 65x

Profit = Revenue - Cost = -0.0006x^3 + 65x - (-0.002x^2 + 13x + 4000) = -0.0006x^3 + 0.002x^2 + 52x - 4000

For maximum profit, dP/dx = 0
-0.0018x^2 + 0.004x + 52 = 0
Using quadratic formular, x = 171

Therefore, <span>the production level that will yield a maximum profit for the manufacturer is 171 discs.</span>
8 0
3 years ago
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