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Elenna [48]
3 years ago
13

Multiplication can be represented as repeated addition. Repeated multiplication leads to exponents. Use what you know about mult

iplying signed numbers to evaluate each expression. (-3)3
Mathematics
1 answer:
Alex3 years ago
6 0

Answer:

-27

Step-by-step explanation:

-3^3  (the number after ^ is the exponent)

-3 x -3 x -3

-3 x -3 = 9 (multiplying two negatives results in a positive)

9 x -3 = -27

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Let x be the amount of cement and y be the amount of sand. If <span>the ratio of cement to sand for mortar is 1:3, then \frac{x}{y} = \frac{1}{3} and y=3x.
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The Sahara Desert has an area of approximately 9,400,400 km2. While estimates of its average depth vary, they center around 150
horrorfan [7]

It would take 65433661 years to re-create the Sahara Desert

<h3>How many years would it take to re-create the Sahara Desert?</h3>

The given parameters are:

Surface area = 9,400,400 km^2

Depth = 150 m

This means that the volume is

Volume = Surface area * Depth

So, we have

Volume = 9,400,400 km^2 * 150 m

Express as meter square

Volume = 9,400,400 * 1000000 m^2 * 150 m

Evaluate the product

Volume = 9,400,400 * 150,000,000 m^3

A small dump holds 20.5 m^3 for 30 seconds.

So, the duration is:

Time = (9,400,400 * 150,000,000 m^3)/(20.5 m^3 per 30 seconds)

Evaluate the product and quotient

Time =  2.0635024e+15 seconds

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Time =  2.0635024e+15 * 3.171e-8 year

Evaluate the product

Time = 65433661.104 years

Approximate

Time = 65433661 years

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1 year ago
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14+7=21 21+21=42 100-42=68
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