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ser-zykov [4K]
2 years ago
7

(24 ÷ 3 - 2) × 4 [points n brainliest]

Mathematics
1 answer:
jekas [21]2 years ago
6 0

Answer:

24

Step-by-step explanation:

(24 / 3 - 2) x 4

  1. 24 divide by 3 equals 8
  2. then 8 subtract 2 equal 6
  3. last 6 multiply 4 equals 24
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At 7:00 A.M., Alicia pours a cup of tea whose temperature is 200°F. The tea starts to cool to room temperature (72°F). At 7:02 A
alexgriva [62]

Answer: A) Option B

B) 22.3 minutes.

Step-by-step explanation:

The temperature decreases in an exponential decrease, this means that we can write the equation as:

T(x) = A*r^x + B

Where A is the difference between the initial temperature and the room temperature, B is the room temperature, and r is a positive number smaller than 1, that says "how fast" the temperature decreases (and x is the variable, in units of time)

We know that the initial temperature

A = 200° - 72° = 128°

B = 72°

T(x) = 128°r^x + 72°

The only option with those two values is option B.

T(x) =  128(0.989)^x + 72

We should check that when x = 2m, the temperature must be 197°

T(2m) = 128*(0.989)^2 + 72 = 197.2° (that we can round down to 197°)

So this equation is correct

Now we want to find the time such the temperature is 172°F

then:

172° = 128°(0.989)^x + 72°

100° = 128°(0.989)^x

100/128 = (0.989)^x

x = ln(100/128)/ln(0.989) = 22.3 minutes.

Let's check in our equation:

T(22.3) =  128°(0.989)^22.3 + 72 = 172°

8 0
3 years ago
PLSSSSSS HELPPPPPPP FAST WILL GIVE BRAINLIEST
lubasha [3.4K]
The answer is the last option, hope this helps lol
8 0
3 years ago
Read 2 more answers
A jacket usually sells for $69.00. If the jacket is 30% off, and sales tax is 8%, what is the total price of the jacket, includi
Ivan
$52.16
30% of 69 is 20.7.
69-20.7= $43.30
8% of 43.3 is 3.864. 
43.3+3.864= $52.164
round down due to the 4.
$52.16
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3 years ago
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pav-90 [236]
I believe it is x = 2f

Happy studying
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3 years ago
Numbers are (-20,10) and (40,-50)​
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