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Kamila [148]
2 years ago
12

Write the original equation of -18x-15= -87

Mathematics
2 answers:
Sunny_sXe [5.5K]2 years ago
8 0

Answer:

x=4

Step-by-step explanation:

-18 x 4 x -15 = -87

jeka942 years ago
3 0

Answer:

-18x-15=-87

-(18x+15)=-(87)

18x+15=87

18x=87-15

18x=72

x=4

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Sarah has gone to work for 60 days. On 39 of those days, she arrived at work before 8:30 A.M. On the rest of the days she arrive
IgorC [24]
There is a 35%  chance she will arrive after 8:30AM
4 0
2 years ago
Please explain I really need help
velikii [3]

Answer:

1. 1343 years

2. 9 hours

3. 39 years

Step-by-step explanation:

1. Given, half-life of carbon = 5730 years.

∴ λ = 0.693/half-life of carbon = 0.693/5730 = 0.000121

If N₀ = 100 then N = 85

Formula:- N = N₀*e^(-λt)

∴ 85 = 100 * e^(-0.000121t)

∴㏑(-0.85)=-0.000121t

∴ t = 1343 years

2. Given half-life of aspirin = 12 hours

λ = 0.693/12 = 0.5775

Also N₀ = 100 then 70 will disintegrate and N = 30 will remain disintegrated.

∴ 70 = 100 *e^(-0.05775t)

0.70 = e^(-0.05775t)

㏑(0.70) = -0.05775t

∴ t = 9 hours

3.  The population of the birds as as A=A₀*e^(kt)

Given that the population of birds fell from 1400 from 1000, We are asked how much time it will take for the population to drop below 100, let that be x years.

The population is 1400 when f = 0, And it is 1000 when f = 5

We can write the following equation :

1400 = 1000e^(5t).

∴1400/1000 = e^(5k)

∴ k = ㏑(1.4)/5

We need to find x such that 1400/100 = e^(xk)

14 = e^(xk)

∴ x = 39 years

5 0
3 years ago
Divide: <br> -20.48<br> -----------<br> -4
marysya [2.9K]
If the question was -20.48 divided by -4 then the answer is 5.12
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3 years ago
Answer this really quick
ivann1987 [24]

Answer:

the equation is y = ax + b (a ≠ 0)

see in the graph, the line passed through (0;3) and (1;5)

=>b = 3

   a + b = 5

<=> a = 2

     b = 3

=> the equation is y = 2x + 3

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
What is 4.12 rounded to the nearest tenth
Gnom [1K]
4.12 rounded to the nearest tenth is 4.1
8 0
3 years ago
Read 2 more answers
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