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Stella [2.4K]
3 years ago
15

Write an expression that can be used to multiply 6x198 mentally

Mathematics
2 answers:
slavikrds [6]3 years ago
5 0
You could multiply
6 times 100

then 6 times 90 or 6 times 9 then add zero

and finally 6 times 8

then add them all together

i don't think its what you want but this is what i would do. mentally
Vilka [71]3 years ago
4 0
6×100+6×90+6×8 I think that is the answer
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Answer:

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Step-by-step explanation:

40 + 6x + 2 = 90   {Complementary angles}

Combine like terms

40+ 2 + 6x = 90

     42 +6x = 90         {Subtract 42 form both sides}

             6x = 90 - 42

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30.06 degree Celsius at 4:00 PM.

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We have been given that on a hot Saturday morning while people are working​ inside, the air conditioner keeps the temperature inside the building at 24 degrees C. At noon the air conditioner is turned​ off, and the people go home. The temperature outside is a constant 35 degrees C for the rest of the afternoon. The time constant for the building is 5 ​hr. We are asked to find the temperature inside the building at 4:00 PM.

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T(t)=M_0+(T_0-M_0)e^{-kt}, where

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Upon substituting our given values in Newton's cooling law, we will get:

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