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3 years ago

Explain why -4 is not a real number but -8 is two equations below of what they look like

Mathematics

1 answer:

Margarita [4]3 years ago

7 0

-4 isn't a real number because there is no square root of -4. However, there is a cube root of -8, because -2 * -2 * -2 = -8.

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Find the perimeter of the figure shown above. a. 40 cm c. 52 cm b. 60 cm d. 75 cm Please select the best answer from the choices

cluponka [151]

I think the answer is 52 cm. If you add all the numbers and find out the two missing numbers you will get 52. ( if I’m sorry so how, I’m sorry :))

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3 years ago

Read 2 more answers

Relatively Simple Math, pls lend a hand. 50 points and Brainliest

baherus [9]

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2 years ago

What is the inverse of the function f(x) = 2x – 10?

Gala2k [10]

$\bf f(x)=\boxed{y}=2\boxed{x}-10\qquad inverse\implies =\boxed{x}=2\boxed{y}-10\impliedby f^{-1}
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3 years ago

A bag has 8 bagels. Three of the bagels r cranberry. What % of the bagels r cranberry?

Solnce55 [7]

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3 years ago

A cable that weighs 6 lb/ft is used to lift 500 lb of coal up a mine shaft 400 ft deep. Find the work done. Show how to approxim

stealth61 [152]

Answer:

8.2 *10^5 ft lb

Step-by-step explanation:

Wcoal = 800*500 = 400000 = 4*10^5 ft lb

$Wrope =\int\limits^{400}_0 {6(400-y)} \, dy$

Using a right Riemann sum

The width of the entire region to be estimated = 400 - 0 = 400

Considering 8 equal subdivisions, then the width of each rectangular division is 400/8 = 50

F(x) = 6(400-y)

$\left[\begin{array}{cccccccccc}x&0&50&100&150&200&250&300&350 &400\\f(x)&2400&2100&1800&1500&1200&900&600&300&0\end{array}\right]$

Wrope = 50(2100) + 50(1800) + 50(1500) + 50(1200) + 50(900) + 50(600)

+ 50(300) + 50(0) = 420000 = 4.2 * 10^5 ft lb

Note: Riemann sum is an approximation, so may not give a accurate value

work done = Wcoal + Wrope= 4*10^5+ 4.2 * 10^5 = 8.2 *10^5 ft lb

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2 years ago