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Morgarella [4.7K]

3 years ago

8

It takes Ann, brad and chad two hours to paint a fence. When Ann works alone , she can paint the same fence in six hours. When b

rad works alone , he can paint the same fence in four hours. How long would it take for chad to paint the same fence on his own

1 answer:

andriy [413]3 years ago

8 0

Answer:

it would take chad 8.1 hours to paint the fence on his own

Step-by-step explanation:

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0 = x^3-8<br> Help me with this problem

ser-zykov [4K]

Answer:

6

Step-by-step explanation:

7 0

3 years ago

I need help with another set of math questions.

Anit [1.1K]

For question 11, you essentially need to find when h(t) = 0, since that is when the height of the ball reaches 0 (ie touches the ground).

For question 12, it is asking for a maximum height, so you need to find when dh/dt = 0 and taking the second derivative to prove that there is maximum at t. That will find you the time at which the ball will hit a maximum height.

Rinse and repeat question 12 for question 13

7 0

3 years ago

The weights of adobe bricks used for construction are normally distributed with a mean of 3 pounds and a standard deviation of 0

dedylja [7]

Answer: a) 0.8413, b) 0.9987.

Step-by-step explanation:

Since we have given that

Mean = 3 pounds

Standard deviation = 0.25 pounds

n = 28 bricks

So, (a) What is the probability that all the bricks in the sample exceed 2.75 pounds?

$P(X>2.75)\\\\=P(z>\dfrac{2.75-3}{0.25}\\\\=P(z>\dfrac{-0.25}{0.25})\\\\=P(z>-1)\\\\=0.8413$

b) What is the probability that the heaviest brick in the sample exceeds 3.75 pounds?

$P(X>3.75)\\\\=P(z>\dfrac{3.75-3}{0.25})\\\\=P(z>\dfrac{0.75}{0.25})\\\\=P(z>3)\\\\=0.9987$

Hence, a) 0.8413, b) 0.9987.

4 0

3 years ago

The sum of a two digit number is 18. If the digits are reversed, the number remains the same. Find the number.

Yanka [14]

Answer: 99

Explanation: 9+9 = 18
and when you switch the order of the digits, it is still 99.

Hope that helps ;)

4 0

3 years ago

6x to the power of 2 + 7x to the power of 3 + 8x to the power of 5 + 9

Paha777 [63]

Answer:

I couldn't understand question paper plz can u give question with photo too.

4 0

3 years ago