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Tatiana [17]
3 years ago
15

4. What’s the answer to this question please

Mathematics
1 answer:
dusya [7]3 years ago
4 0

Answer:

The answer is D

(x=3, y=8)

Step-by-step explanation:

We want to reduce as many variable as we can so, we can obtain the value for the remaining variables.

Therefore, the first equation y=x+5 multiply it -2., you have -2y=-2x-10 and sum it to the second (2y-x=13), you will obtain the following: -x=13-2x-10.

You have x=3.

If you substitute x=3 in the first equation, you have y=8

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What is the solution to 4x + 2 = 6(-2x - 5) ?
exis [7]

Answer:

x= -2

Step-by-step explanation:

4x + 2 = 6(-2x - 5)

Distribute

4x+2 = -12x-30

Add 12x to each side

4x+2+12x = -12x-30+12x

16x+2 = -30

Subtract 2 from each side

16x+2-2=-30-2

16x = -32

Divide by 16

16x/16x = -32/16

x = -2

5 0
2 years ago
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A line is an undefined term because it
Svet_ta [14]

Answer:

Option C) describes something that does not have width or depth      

Step-by-step explanation:

We are given the following information in the question:

We may define line as:

  • A line is a straight one-dimensional figure having no thickness and extending infinitely in both directions.
  • A line is sometimes called a straight line.
  • It is demonstrated by arrow on both sides showing that it can be extended on both sides.
  • A line can be considered undefined term because it tells us about something that does not have width or depth.
  • A lines can  extend its length in both side infinitely. It contains arrowheads indicating it can extend.

Thus, the correct option is Option C) describes something that does not have width or depth.

8 0
3 years ago
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You have 480 grams of a radioactive kind of samarium. If its half-life is 90 years,
lisov135 [29]

Answer:

120 grams will be left after 180 years.

Step-by-step explanation:

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by

                                             N(t)=N_0(\frac{1}{2})^\frac{t}{t_{1/2}}

where,

N(t) = quantity of the substance remaining

N_0 = initial quantity of the substance

t = time elapsed

t_{1/2} = half life of the substance

From the information given we know that:

  • The initial quantity is 480 g,
  • The half-life is 90 years,
  • 180 years is the time elapsed.

And we want to find how much will be left. For this we use the above formula.

N(t)=480\left(\frac{1}{2}\right)^{\frac{180}{90}}\\\\N(t)=480\left(\frac{1}{2}\right)^2\\\\N(t)=480\cdot \frac{1}{2^2}=120

120 grams will be left after 180 years.

3 0
3 years ago
Find slope: PLEASE HELP !
mixas84 [53]

Answer:

1/5

Step-by-step explanation:

up 1, right 5

5 0
2 years ago
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How many ways can two names be chosen from 76 in a raffle if only one entry per person is allowed
Fantom [35]

2850

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2 years ago
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