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gayaneshka [121]
3 years ago
10

Se logx 25 = -2, então log 5 x é igual a:

Mathematics
1 answer:
Zigmanuir [339]3 years ago
8 0
Your question is on Spanish but I'll try to answer it
log x 25 = -2 => x^-2 = 25 

we know that x^-2 is the reciprocal value that is also written as (1/x)^2, according to this 

=> (1/x)^2 = 5^2 => 1/x = 5 => x= 1/5

Check   log (1/5) 25 = x => (1/5)^x = 5^2 => 5^-x = 5^2 => -x=2 =>
x= -2    Good luck!!!  


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If you have 500 apples and your freind asks for two apples but he says he will pay $3.00 for it then it changes to $9.00 how muc
lisov135 [29]
The answer is 494 apples left. if 2 apples cost $3 and he wants $9 worth then that is (9/3)*2=6 apples total taken so 500-6=494 apples left

hope this helps! thank you!
7 0
3 years ago
Mr. Selan loves the 99-cent menu at Wendy's (sadly prices went up a few years ago). He used to buy two chicken sandwich at 99-ce
iogann1982 [59]

Answer:

Mr. Selan would pay $2.15 for the sandwiches with tax.

Step-by-step explanation:

Given that:

Cost of each sandwich = 99 cents

Cost of two sandwiches = 99*2 = 198 cents

Sales tax = 8.5%

Sales tax = \frac{8.5}{100}*198=16.8\ cents

Sales tax = 17 cents

Total cost = 198 + 17 = 215 cents

Total cost = $2.15

Hence,

Mr. Selan would pay $2.15 for the sandwiches with tax.

4 0
3 years ago
How do I figure this out? Y = - ⅙ x -1
astra-53 [7]
Now the fraction is your slope, it determines where your point goes, in this equation you would move up 6 times and move left once because your slope is -1/6. Now your numerator is the one that moves right if it's positive or left if if's negative. Your denominator is the one that moves up if it's positive and down if it's negative. So you're either going up 6 times and moving left once and if you're plotting two points then you move down 6 times and right once, it's basically the reverse. Now the number on the very right is your y-intercept it's always on the y-axis and that's how you start your line. from there you use the slope and plot the two other points and then you connect the points. That's how you do it, hope this helps.

3 0
3 years ago
Matt bought a new car at a cost of $25,000. The car depreciates approximately 15% of its value each year. What will the car be w
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5 0
3 years ago
the mean cost of domestic airfares is RS 385 per ticket. Airfares were based on the total ticket value, which consisted of the p
Vladimir [108]

Answer: 0.0668

Step-by-step explanation:

Given the following :

Mean (m) Cost = RS385

Standard deviation (s) = RS110

Assume a normal distribution, Probability that domestic airfare is RS550 or more?

P(x > 550)

Find the z - score

Z - score = (x - m) / s

Where x = 550

Z = (550 - 385) / 110

Z = 165 / 110 = 1.5

P(Z > 1.5) = 1 - P(Z ≤1.5)

Using the z table : 1.5 = 0.9332

Therefore,

1 - P(Z ≤1.5) = 1 - 0.9332 = 0.0668

P(x > 550) = 0.0668

7 0
4 years ago
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