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3 years ago

PLS HELP ME WILL MARK YOU AS BRAINLIEST!!!

Mathematics

1 answer:

algol [13]3 years ago

4 0

The first one is x^2-3x+8 and the third one is -x^3+5x^2-7x+35.

sorry i didn't have time to do the other ones but i hope this helpsss

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What is the ratio 15 girls to 6 boys in simplest form?

Alenkinab [10]

5 girls to 2 boys, it’s not asking for boys and girls

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3 years ago

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Show each step to solve the equation below:<br><br> 4x+5=x+2

Eduardwww [97]

$4x + 5 = x + 2$
Subtract 2 from both sides.

Your equation will be: 4x+3=x
Subtract 4x from both sides.
Yoir equation will be: 3= -3x
Divide by -3x on both sides.

Your final answer: x=-1

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3 years ago

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A spherical balloon is inflated so that its volume is increasing at the rate of 3 ft3/min. How fast is the diameter of the ballo

beks73 [17]

When an spherical balloon volume is increasing at the rate of $3ft^3/min$ then the diameter of the balloon is increasing $\frac{3}{2\pi }ft /min$

How can we find the rate of change of balloon's diameter ?

The volume of a spherical balloon is $v=\frac{4}{3} \pi r^3$

In form of diameter we can write as

$v=\frac{4}{3} \pi (\frac{D}{2} )^3\\=\frac{1}{6} \pi D^3$

Now we will differentiate both sides wrt to $t$ we get

$\frac{dv}{dt} =\frac{1}{6} \pi 3D^2 \frac{dD}{dt} \\\frac{dD}{dt} =\frac{2}{\pi D^2} \frac{dv}{dt} \\\\when r=1\\D=2ft$

Given in the question $\frac{dv}{dt} =3ft^3/min$

thus when we substitute the values we get

$\frac{dD}{dt} =\frac{2}{\pi *2^2} (3)\\\frac{dD}{dt}=\frac{3}{2\pi } ft/min$

Learn more about the differentiation here:

brainly.com/question/28046488

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2 years ago

Alonso goes on a kayaking trip that costs $50. At the end, he wants to tip the guide 15%. How much will the tip be?

xeze [42]

Answer:

I believe that the tip would be $7.50

Step-by-step explanation:

Well I'm assuming that they want us to find 15% of 50. And 15% of 50 is 7.5

Meaning that the answer is A

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2 years ago

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To save money, a local charity organization wants to target its mailing requests for donations to individuals who are most suppo

Naya [18.7K]

Answer:

$(0.55525, 1.24475)$

Step-by-step explanation:

Given that to save money, a local charity organization wants to target its mailing requests for donations to individuals who are most supportive of its cause.

Men women

Sample size 5 5

Mean rate 6.2 5.3

Mean diffference = $6.2-5.3=0.9$

Std error for difference = 0.25 (given)

Since we have two groups and also sample sizes are very small we can use t significant value for finding out confidence interval

df = 5+5-2 =8

t critical value for 80% two tailed = 1.397

Conf interval 80%

= $(0.9-1.397*0.25, 0.9+1.397*0.25)\\= (0.55525, 1.24475)$

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3 years ago