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Amanda [17]
3 years ago
8

X = 5/2 or 2.5

Mathematics
1 answer:
noname [10]3 years ago
6 0
2.5 is the wander to your question
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2 years ago
Please help this question.
sergejj [24]

Answer:

a). 59.049°C

b). 2.1179 seconds

Step-by-step explanation:

Expression representing the final temperature after decrease in temperature of the metal from 100°C to T°C is,

T = 100(0.9)^{x}

where x = duration of cooling

a). Temperature when x = 5 seconds

T = 100(0.9)⁵

  = 59.049

  ≈ 59.049°C

b). If the temperature of the metal decreases from 100°C to 80°C

Which means for T = 80°C we have to calculate the duration of cooling 'x' seconds

80 = 100(0.9)^{x}

0.8 = (0.9)^{x}

By taking log on both the sides

log(0.8) =log[(0.9)^{x}]

-0.09691 = x[log(0.9)]

-0.09691 = -0.045757x

x = \frac{0.09691}{0.045757}

x = 2.1179

x ≈ 2.1179 seconds

3 0
3 years ago
Is the statement true or false? If false, give a counterexample.
scoundrel [369]

Answer:

D. false; if a = 1, b = 2, and c = 3, then 1(2 + 3) ≠ 1(2) + 2(3)

Step-by-step explanation:

A is false, because the a is being distributed/ being multiplied to all terms inside the parenthesis, and not the term b.

B is also false. There is no indicated negative signs.

C is also false because 1(1 + 1) is EQUAL to 1(1) + 1(1)

D is true.

6 0
3 years ago
If D =RT<br> Calculate the distance when the rate is 20 MPH and Time =15 hours
algol13

Answer:

300m

Step-by-step explanation:

  • Because d = rt
  • 20 * 15 = 300
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1 year ago
A political scientist claims that negative advertising on television affects younger voters more than it affects older voters. T
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Answer:

E

Step-by-step explanation:

8 0
3 years ago
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