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iVinArrow [24]
3 years ago
10

The density of water is 1 gram per cubic centimeter. A more dense object will sink, and a less dense object will float. Will a m

arble with a radius of 1.4 cm and a mass of 9 grams sink or float in water? The marble will (float/sink) because the density of the marble is about (0.71, 0.78, 1.28, 1.40) grams per cubic centimeter.
Mathematics
1 answer:
KengaRu [80]3 years ago
6 1

Answer:

sink at 1.28 g/cm^3

v = 4/3 \pi r^{3}

v = 4/3 \pi 1.4^{3}

v =11.49 /9 =1.28

Step-by-step explanation:

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Answer: B
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2 years ago
If the discriminant of a quadratic equation is equal to -9, which statement describes the roots?
Mice21 [21]

ANSWER

No real roots.

The roots are complex or imaginary.

EXPLANATION

The quadratic equation

a {x}^{2}  + bx + c = 0

has discriminant,

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If the discriminant is less than zero , then the quadratic equation has no real roots.

The given discriminant is -9.

Since -9 is less than zero, it means the quadratic equation has complex or imaginary roots.

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3 years ago
Three workers have to do a certain job. The first worker can finish the job in 8 hours. The second worker can finish the job in
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Working together three workers would take 1 hour 36 minutes to finish the job

<em><u>Solution:</u></em>

Given that first worker can finish the job in 8 hours

So in one hour, first worker can do \frac{1}{8} th of the work

The second worker can finish the job in 4 hours

So in one hour, second worker can do \frac{1}{4} th of the work

The third worker can also finish the job in 4 hours

So in one hour, third worker can do \frac{1}{4} th of the work

<em><u>The three workers working together in 1 hour can do:</u></em>

\frac{1}{8} + \frac{1}{4} + \frac{1}{4} = \frac{1 + 2 + 2}{8} = \frac{5}{8}

The three worker can thus do \frac{5}{8} th of the work in one hour

Hence the three of them together can finish the work in \frac{8}{5} hours

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3 years ago
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Answer:

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Step-by-step explanation:

bc if you sub in 4 for x the equations on both sides are 0

check:

-4 + 4 = 0                         -3 x 4 = -12

0 x 3 = 0                          12 + -12 = 0

                    0 = 0

please mark this as brainiest!!!!

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BRAINLIEST! Solve for k <br>7(9+k)
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No sure I used Photomath hope it’s a start

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