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grin007 [14]
3 years ago
9

Which equation shows this relationship? 8 less a number (n) is 21.

Mathematics
1 answer:
GarryVolchara [31]3 years ago
8 0
N-8=21 should be the answer
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Find the value of from the following right triangle.<br><br>plzzz help i will mark you as brainliest
NikAS [45]

Answer:

12

Step-by-step explanation:

by Pythagoras theorem,

P²+B² =H²

5²+B²=13²

B²= 13²-5²

B²= 169-25

B²= 144

B=√144

B= 12

8 0
3 years ago
On a hot Saturday morning while people are working​ inside, the air conditioner keeps the temperature inside the building at 24
Helen [10]

Answer:

30.06 degree Celsius at 4:00 PM.

Step-by-step explanation:

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.

We will use Newton's law of cooling to solve our given problem.

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

T(t) = Temperature after t hours.

M_0 = Temperature of surrounding environment,

k = Time constant.

\frac{1}{k}=5\Rightarrow k=\frac{1}{5}

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

T(t)=35+(24-35)e^{-\frac{t}{5}}

T(t)=35-11e^{-\frac{t}{5}}

To find the temperature at 4:00 pm, we will substitute t=4 in our formula as:

T(4)=35-11e^{-\frac{4}{5}}

T(4)=35-\frac{11}{e^{\frac{4}{5}}}

T(4)=35-\frac{11}{2.2255409284924674}

T(4)=35-4.9426186052894379601

T(4)=30.05738139471

T(4)\approx 30.06

Therefore, the temperature inside building would be approximately 30.06 degree Celsius at 4:00 PM.

5 0
3 years ago
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alexdok [17]

Answer:

55

Step-by-step explanation:10 percent of 50 is 5 +50 equals 55

8 0
2 years ago
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Math word problems please help
tatiyna
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1 year ago
Bill and Jasmine together have 94 marbles. Bill has 4 more than twice as many marbles as Jasmine If Jasmine has M marbles, then
laila [671]
<span>Jasmine has 30, bill has 64
</span>
4 0
3 years ago
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