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telo118 [61]
3 years ago
15

For a scientific experiment, a physicist must make sure that the temperature of a metal does not get colder than −78 °C. The phy

sicist changes the metal's temperature at a steady rate of −3 °C per hour.
Let t represent temperature in degrees Celsius. Enter an inequality. Use the fact that the rate of change in temperature times the number of seconds equals the final temperature.


Solve the inequality in the first part. How long will it take the physicist to change the temperature of the metal?


The physicist has to repeat the experiment if the metal gets cooler than −78 °C. How many hours would the physicist have to cool the metal for this to happen?
Mathematics
1 answer:
igor_vitrenko [27]3 years ago
4 0
-3t < -78 
÷-3      ÷-3
_________
t > 26

78÷26=3
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Write the additive and multiplicative inverse of -1/2​
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Answers:

Additive Inverse = 1/2

Multiplicative Inverse = -2

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Explanation:

The additive inverse of x is -x. The two add to 0.

So the additive inverse of -1/2 is 1/2 because -1/2+1/2 = 0.

--------------

The multiplicative inverse of x is 1/x

More thoroughly, the multiplicative inverse of a/b is b/a.

We apply the reciprocal operation here.

That means the multiplicative inverse of -1/2 is -2/1 which simplifies to -2.

We can see that (-1/2)*(-2) = 1

Any nonzero value multiplied with its multiplicative inverse will always result in 1.

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