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Darina [25.2K]
3 years ago
8

Which system of equations does not have a real solution?

Mathematics
2 answers:
dolphi86 [110]3 years ago
7 0

Answer:

It's A.

Step-by-step explanation:

Let's look at option A:

From the second equation y =  -10 - x. Substituting in the first equation:

-10 - x = x^2 + 3x - 5

x^2 + 4x + 5 = 0

Checking the discriminant b^2 - 4ac we get 16 - 4*1*5 = -4 so there are no real roots. (A negative discriminant means no real roots).

So A has no real solution.

B.

x^2 + 3x - 5 =  (20 - 4x)/5 = 4 - 0.8x

x^2 +3.8x - 9 = 0

b^2 - 4ac = (3.8)^2 - 4*1*-9 = 50.44 (positive) so there are real roots.

C.

x^2 + 3x - 5 =  -9 - x

x^2 + 4x + 4 = 0

b^2 - 4ac =  4^2 - 4*1*4 = 0  so there are real roots.

Tatiana [17]3 years ago
6 0

Answer:

Correct answer is A!

Step-by-step explanation:

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Answer:

I think the answer is 3

3 0
3 years ago
2 balloons and 3 cakes cost $26.
mel-nik [20]

Answer:

The cost of one balloon is 4 dollars

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Step-by-step explanation:

The way I did it was by substituting different numbers and seeing if they equaled forty or 26.

my thought process:

1 balloon= 5

1 cake= 10

that doesnt work for 2 balloons and 3 cakes

1 balloon=5

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that works for 4 balloons and 4 cakes but not 2 balloons and 3 cakes

1 balloon=4

1 cake=7

I'm sorry I'm way too tired to finish this 0-0 anyways yeah that's the correct answer :)

7 0
3 years ago
A police officer recorded the speeds of 100 cars in a 50-mile-per-hour zone. The results are in the box plot shown. How many car
miss Akunina [59]

Answer: 25 cars

Step-by-step explanation:

This is a box plot and it is a useful graph for showing the minimum, maximum, median and quartile values of a data distribution.

The box you see in the middle is the Interquartile range. In other words, the first line on the box is Q1 and the line at the end of the box is Q3.

The line in the middle of the box is the median or Q2.

The distance between Q1 and the median is 25%.

The number of cars between 40 and 48 miles per hour is therefore 25% of the total.

= 100 * 25%

= 25 cars

6 0
3 years ago
Read 2 more answers
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Answer:

d) 80

Step-by-step explanation:

(35% = 0.35)

equation:

⇒ 0.35x = 28

divide 0.35 on both sides

⇒ \frac{0.35x}{0.35} = \frac{28}{0.35}

solve:

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7 0
3 years ago
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zaharov [31]

Answer:

Huh?

Step-by-step explanation:

6 0
3 years ago
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