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Marina CMI [18]
3 years ago
8

At the track meet, Ervin won the 100-meter dash with a time of 12.45 seconds. Landon finished second. Landon's time contains a 4

with a value 1/10 the value of the 4 in Ervin's time. What could be Landon's time in the 100-meter dash?
Mathematics
1 answer:
solong [7]3 years ago
3 0
Breaking down the value 12.45 

12.45 = 10 + 2 + 0.4 + 0.05

The value of digit '4' in 12.45 is 0.4

1/10 of 0.4 is 0.4 ÷ 10 = 0.04

One possibility of Landon's time = 12.54 [Need to make sure that Landon takes longer than Ervin since he comes second]
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Solve 5(2^x+4)=15 round to the nearest thousandth
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Answer:

Step-by-step explanation:

Begin by dividing by 5

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Is this written as 2^(x + 4) = 3? I think it is.

Take the log of both sides

log 2^(x + 4) = log(3)

(x + 4) * log(2) = log 3

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(x + 4) = log2 / log3

x + 4 = 0.63093               Add 4 to both sides

x = -3.369                        Rounded to the nearest thousandth

====================

If you mean the question exactly as it is written (the 4 is not part of the power)

5(2^x + 4) = 15

2^x + 4 = 3

2^x = 3 - 4

2^x = - 1

This can't be done 2 to any power should be >0.

if x>0 then this will give an ever increasing number

if xK0 then this will give an ever decreasing answer but still greater than 0.

No value will make 2^x go to something minus.

If I have misread this in some way, leave a note and I will get back to you.

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