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elixir [45]
3 years ago
12

Solve using the quadratic formula. Select the correct solution. -7x=2x^2+9

Mathematics
1 answer:
gayaneshka [121]3 years ago
7 0

The answer to your question is B!

Have a wonderful day.

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What is the range of possible sizes for side x
Xelga [282]

Answer:

0.5 < x < 16.5

Step-by-step explanation:

For a triangle (by the triangular inequality theorem), we know that the sum of any two sides must be larger than the other side.

When we have a triangle and we know two sides, let's define the measures of these sides as S1 and S2.   (such that S2 > S1)

By the first property, we will have that S1 + S2 > S3

Where S3 is the third side, the one that we do not know.

But there is also a lower restriction, given by:

S2 - S1 < S3 < S1 + S2

This is because we also must have:

S1 + S3 > S2

and

S2 + S3 > S1

We can rewrite both of these to get:

S2 - S1 < S3

S1 - S2 < S3

Because S2 > S1, the first inequality is more restrictive, so we need to use that one.

Then we get the inequality:

S2 - S1 < S3 < S1 + S2

Ok, in this case, the shorter side is 8.0 then:

S1 = 8.0

And the longer side is 8.5, then:

S2 = 8.5

And the third side is x, S3 = x

Replacing those in our inequality, we get:

8.5 - 8.0 < x < 8.5 + 8.0

0.5 < x < 16.5

This is the range of possible sizes for side x.

3 0
3 years ago
Hiram drove 15 miles in 12 minutes. If he
Pavlova-9 [17]
Since distance equals speed times time (d = st), we have

t = d/s

where d = 120 miles and s = 15 miles per hour

t = d / s
t = 120 / 15
t = 8

It will take 8 hours to drive 120 miles at a speed of 15 miles per hour.
8 0
3 years ago
Find the surface area of each solid.
Andre45 [30]

Answer:

232 in^2

Step-by-step explanation:

80 + 80 + 20 + 20 + 16 + 16 = 232

Check previous answer for better explanation!

7 0
2 years ago
Five more than 3 times a number
ipn [44]

Answer:

3x+5

Step-by-step explanation:

Let number =X

So

Five more than 3 times a number

3x+5

5 0
3 years ago
Read 2 more answers
If a square has side lenght 3m, than its perimeter is 12m.
Luda [366]
Fu you ahole hhhhhhhhhhhhhhhhhhhhhhhhhh
7 0
3 years ago
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