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bazaltina [42]
3 years ago
15

{3.1 + y=8{2x + 2y = 8​

Mathematics
1 answer:
Eva8 [605]3 years ago
3 0

(x,y)=(-0.9,4.9)

{3.1 + y=8

{2x + 2y = 8

{y=4.9

{2x + 2y = 8

2x + 2y = 8

2x + 2×4.9 = 8

x=-0.9

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Vivian won a $18 gift certificate to a Mexican restaurant. She must spend more than the
7nadin3 [17]

Answer:

7x+y>18

Step-by-step explanation:

7x is 7 dollars times the amount of burritos

y is 1 dollar times the amount of tacos

> because the final price has to be more than the gift card

18 the money on the gift card

7 0
3 years ago
Need help on this problem
faust18 [17]

Using an exponential function, it is found that:

  • For Country A, the doubling time is of 43 years.
  • For Country B, the growth rate is of 1.9% per year.

<h3>What is the exponential function for population growth?</h3>

The exponential function for population growth is given as follows:

P(t) = P(0)e^{kt}

In which:

  • P(t) is the population after t years.
  • P(0) is the initial population.
  • k is the exponential growth rate, as a decimal.
  • t is the time in years.

For Country A, we have that k = 0.016. The doubling time is t for which P(t) = 2P(0), hence:

P(t) = P(0)e^{kt}

2P(0) = P(0)e^{0.016t}

e^{0.016t} = 2

\ln{e^{0.016t}} = \ln{2}

0.016t = \ln{2}

t = \frac{\ln{2}}{0.016}

t = 43 years.

For Country B, P(36) = 2P(0), hence we have to solve for k to find the growth rate.

P(t) = P(0)e^{kt}

2P(0) = P(0)e^{36k}

e^{36k} = 2

\ln{e^{36k}} = \ln{2}

36k = \ln{2}

k = \frac{\ln{2}}{36}

k = 0.019.

For Country B, the growth rate is of 1.9% per year.

More can be learned about exponential functions at brainly.com/question/25537936

#SPJ1

3 0
1 year ago
-8d-5d+7d=72 can you help me figure out d
Kryger [21]

Answer:

d = -12

Step-by-step explanation:

Add -8 -5 +7

take that number : -6

72 divided by -6 = -12

d = -12

8 0
2 years ago
Please i need help finishing this test i’ll give brainly to a correct answer
rjkz [21]

imma go with my gut and say b :?

7 0
3 years ago
15 is 30% of what number?
dangina [55]
#1---> let the number you are trying to find be x for the following questions

30%*x=15
x=15/30%
x=50

#2
10%*x=14
x=14/10%
x=140

#3
(4/32)*100
 is the same as (1/8)*100= 12.5%

#4
1%* x=11
x=11/1%
x=1100

by the way * means multiply

5 0
3 years ago
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