2 years ago

Can someone help me

Mathematics

1 answer:

neonofarm [45]2 years ago

7 0

It is the second one

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Ne4ueva [31]

6 is d, 7 is b, 8 is c, 9 is c

7 0

2 years ago

A migrating bird flies 700 miles in 1414 hours. How many miles does it fly in 33 hours

Lisa [10]

In 1414 hours it covered 700 miles

In 1 hour it would have covered (700/1414) mile

In 33 hours it will then cover : 700/1414 * 33 = 16.34

So in 33 hours it will cover ≈ 16.34 miles.

5 0

2 years ago

HELP!!!!! WILL MARK BRAINLIEST 10 POINTS

vichka [17]

Josh is incorrect, he did not examine the expression correctly, therefore his answer was wrong.

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3 years ago

webassign If a snowball melts so that its surface area decreases at a rate of 6 cm2/min, find the rate at which the diameter dec

drek231 [11]

Answer:

The answer is $\frac{3}{10\pi } cm/min$

Step-by-step explanation:

Assuming the snowball is a perfect sphere, then if A denotes the surface area and D the diameter then:

$A=4\pi r^{2} = 4\pi (\frac{D}{2} )^{2} =\pi D^{2}$

Differentiating wrt r we have:

$\frac{dA}{dD} =2\pi D$

We are told that $\frac{dA}{dt}= -6$ and we want to find $\frac{dD}{dt}$

By the chain rule we have:

$\frac{dA}{dD}=\frac{dA}{dt}.\frac{dt}{dD}=\frac{\frac{dA}{dt} }{\frac{dD}{dt} }$

∴ $2\pi D=-\frac{6}{\frac{dD}{dt} }$

∴ $\frac{dD}{dt}=-\frac{6}{2\pi D}$

When D=10 then

$\frac{dD}{dt} =-\frac{6}{10*2\pi } =-\frac{3}{10\pi }$

The sign (-) shows that the D is decreasing.

3 0

2 years ago

Which number goes in the box to make this a true sentence? 65 × 32 = (65 × 30) + (65 × ) PLZZ HELP!

lutik1710 [3]

The answer would be 2.

65 x 32 = 2080.

(65 × 30) = <span>1950</span><span>
(65 × 2) = 130

1950 + 130 = 2080

To make this easier, you can 30 from 32.</span>

7 0

3 years ago

Can someone help me​

Can someone help me