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3 years ago

A pile of sand has a weight of 90 kg.

Mathematics

2 answers:

dem82 [27]3 years ago

5 0

Answer:

i hope it helps

mapriend

Dima020 [189]3 years ago

5 0

Answer:

Step-by-step explanation:

divide 90 by 2, 3, 7

small bags 90 ÷ 2 = 45

medium bag 90 ÷ 3 = 30

large bag 90 ÷ 7 = 12.8 round it to nearet whole number = 13

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Marta has $840 in her savings account. She earns $15 per hour working at a food truck and puts all of her earnings into the bank

Flauer [41]

Let h = the number of hours Marta works

Her savings in her account can be calculated by:

840 + 15h

This needs to be at least $2650 for her trip, so an inequality to solve:

840 + 15h ≥ 2650, where h is the number of hours worked

Now solve:

15h ≥ 1810

h ≥ 1810/15

h ≥ $120\frac{2}{3}$

Marta needs to work at least $120\frac{2}{3}$ hours in order to have enough money for her trip.

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3 years ago

Write an equation of the line that passes the point and given slope (1, -1); m=3

Alex Ar [27]

Answer:

(y+1) = 3(x-1)

Step-by-step explanation: The key here is point slope form. Whenever you are given questions with a given point (y1, x1) and slope m just use this form, (y-y1)=m(x-x1)

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3 years ago

Area of a rectangle<br> Equation

Jet001 [13]

Area = Length x width

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2 years ago

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Greta’s family drinks 3 1/4 quarts of milk and 1 5/6 quarts of juice in one week. About how much more does Greta’s family drink

oee [108]

3/4. Because you first change 3 1/4 in a improper fraction which would be 13/4 then your gonna make the denominators the same so 15/6 times 4 = 60/24. And. 13/4 times 6 = 78/24. Then your going to subtract 78 and 60 which is 18 so you have 18/24 and you can simplify that into 3/4 (does that make any sense)

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3 years ago

a norman window has the shape of a rectangle surmounted by a semicircle. if the perimeter of the window is 25 feet, express the

sp2606 [1]

The area of the window is $\frac{25x}{2} -(1 +\frac{\pi}{2} )\frac{x^2}{2}$

The shape of the Norman window is described as a rectangle surmounted by a semicircle.

Let 'x' be the width of the window.

Then this width corresponds to the diameter of the semicircle.

That is, radius of the semicircle = x/2

Now given the perimeter of the whole window = 25 ft

This perimeter is equal to the sum of 3 sides of the rectangle and the perimeter of the semicircle.

Perimeter of the semicircle = $\frac{2\pi r}{2} = \frac{\pi x}{2}$ , where r is the radius of the semicircle.

Now let 'y' be the length of the window.

Then sum of three sides of the window = 2y + x

So 2y + x + $\frac{\pi x}{2}$ = 25

Therefore, $y =( 25 - x - \frac{\pi x}{2} ) / 2$

Area of the window = Area of the semicircle + Area of the rectangle =

$\frac{\pi x^2}{8} +xy = \frac{\pi x^2}{8} + x( 25 - x - \frac{\pi x}{2} ) / 2\\ = \frac{\pi x^2}{8} + (25x - x^2 - \frac{\pi x^2}{2} ) / 2$

So Area of the window = $\frac{25x}{2} -(1 +\frac{\pi}{2} )\frac{x^2}{2}$

Learn more about area of circle and rectangle at brainly.com/question/4694841

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7 0

1 year ago