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OlgaM077 [116]
3 years ago
11

a marine biologist is doing research on a shell fish that lives 80 feet below sea level. The marine biologist dives into the sea

at a rate that is no less than -5 feet per second. How long will it take the marine biologist to reach the shellfish?
Mathematics
1 answer:
kkurt [141]3 years ago
5 0
16 seconds. Assuming the biologist is traveling at a constant velocity, you can use the equation d = rt to find the time.
80 = 5t
t = 16 seconds
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An instructor wants to write a test with 25 questions where each question is worth 3, 4, or 5 points based on difficulty. He wan
irakobra [83]

ANSWER

Find out the how many 3, 4, and 5 point questions could there be.

To proof

Let us assume that the 3 points based question be = x

Let us assume that the 4 points based question be = y

Let us assume that the 5 points based question be = z

As given

An instructor wants to write a test with 25 questions

than the equation become in the form

x + y + z = 25

he quiz to be worth a total of 100 points.

than the equation is becomes

3x + 4y + 5z =100

As given

He wants the number of 3-point questions to be 4 less than the number of 4-point questions

x = y -4

Than the three equation are

x + y + z = 25 ,3x + 4y + 5z =100 and x = y -4

put  x = y -4 in the x + y + z = 25 ,3x + 4y + 5z =100

than

2y + z = 29, 7y +5z= 112

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10 y -7y + 5y -5y = 145 -112

3y = 33

y = \frac{33}{3}

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put in the  x = y -4

x = 11-4

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7 + 11 +z =25

18 +z = 25

z = 25 -18

z=7

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numbers of the 5 point question be = 7

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3 0
3 years ago
-(6)^-1<br> a.6<br> b.1/6<br> c.-1/6<br> d.-6<br><br> No idea what I'm doing...
Monica [59]
-(6)^{-1} = ?
<span>Representing in fraction for the best understanding
</span>-(\frac{6}{1}) ^{-1} = ?<span>
When the exponent is negative, the inversion is made, the numerator becomes the denominator, and the denominator becomes the numerator, and the change of signal from the exponent, which was negative, becomes positive.

</span>-( \frac{1}{6} )^1 =
\boxed{\boxed{- \frac{1}{6}}}\end{array}}\qquad\quad\checkmark

Answer:
c.-1/6
7 0
2 years ago
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