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3 years ago

In Brazil, about 20 acres of rainforest are destroyed each minute. At this rate, how much rainforest is destroyed per day?

Mathematics

2 answers:

Cerrena [4.2K]3 years ago

5 0

There are 1,440 minutes in a day
20 × 1,440 = 28,800
apparently 28,800 acres of rainforest are destroyed each day

eduard3 years ago

4 0

Each day 28800 acres are being destroyed per day

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A rectangular painting by Leonardo da Vinci measured 62cm along its diagonal. If the painting has a height of 42 cm how wide is

IRINA_888 [86]

ANSWER

45.6cm to the nearest tenth.

EXPLANATION

The diagonal of the rectangular painting is 62cm.

The height of the painting is 42 cm.

The height of the painting h , the diagonal, and the width of the painting forms a right triangle with the diagonal being the hypotenuse.

From the Pythagoras Theorem,

${w}^{2} + {42}^{2} = {62}^{2}$

${w}^{2} = {62}^{2} - {42}^{2}$

${w}^{2} = 2080$

${w} = \sqrt{2080}$

$w = 4 \sqrt{130}$

The width of the painting is 45.6cm to the nearest tenth.

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3 years ago

Factor to find the zeros of the function defined by the quadratic expression. −7x2 − 91x − 280

Mariulka [41]

There are no zeroes for an expression, only for equations.
Assuming equation to be
−7x^2 − 91x − 280=0
-7(x^2+13x+40)=0
-7(x+8)(x+5)=0
by the zero product properties,
x+8=0 => x=-8
or
x+5=0 => x=-5

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3 years ago

8. Anoki Shah washes windows for Sparkle Cleans. He gets paid $1.39 per window. Last week he clean 284 windows. What was his tot

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3 years ago

From a practice assignment: solve the following differential equation given initial conditions

hodyreva [135]

If $y' = e^y \sin(x)$ and $y(-\pi)=0$ , separate variables in the differential equation to get

$e^{-y} \, dy = \sin(x) \, dx$

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$\displaystyle \int e^{-y} \, dy = \int \sin(x) \, dx \implies -e^{-y} = -\cos(x) + C$

Use the initial condition to solve for $C$ :

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Then the particular solution to the initial value problem is

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(A)

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2 years ago

In ΔSTU, t = 3.4 cm, u = 6.9 cm and ∠S=21°. Find the area of ΔSTU, to the nearest 10th of a square centimeter.

Ostrovityanka [42]

Answer:

4.2

Step-by-step explanation

Delta

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3 years ago