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vladimir2022 [97]
3 years ago
5

The sum of a number and 3 times a second number is represented by a+3b= 39. The sum of half the of the first number and 1/3 of t

he second number is represented by 1/2a+1/3b=9. What is the first number a? What is the second number b?
Mathematics
1 answer:
d1i1m1o1n [39]3 years ago
5 0
If we multiply the second equation by 2 we get

a + 2/3b = 18 ............(3)
a + 3b = 39................(1) 
(1) - (3) gives:-
7/3 b = 21
b =  21 * 3/7 = 9 

plug b = 9 in equation (1):-

a + 3(9) = 39 

a = 39-27 = 12 

Answer:- a = 12 and b = 9.
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Answer:

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Step-by-step explanation:

Given:

The probability P that a person responds to an advertisement can be modeled by the function:

P=1-e^{-0.047t}

where t represents number of days since the advertisement first appeared.

To find the probability that a person has responded after 20 days.

Solution:

In order to find the probability that a person has responded after 20 days, we will plugin t=20 in the formula given.

We have:

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Plugging in t=20

P(20)=1-e^{-0.047(20)}

P=1-e^{-0.94}

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P=1-0.3906

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The probability in percentage can be given = 0.6094\times 100= 60.9%

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-x+y=15−x+y=15 and -5x-3y=27−5x−3y=27 <br> Solve the system of equations by combining the equations
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Answer:

x = -9, y = 6.

Step-by-step explanation:

-x + y = 15

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From the first equation:

y = x + 15.

Substituting for y in second equation:

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3 years ago
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