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seraphim [82]
3 years ago
11

Help me please!! This is timed and I’m stuck

Mathematics
2 answers:
marshall27 [118]3 years ago
5 0

Answer:

  • B. 13/2

Step-by-step explanation:

<u>Given equation:</u>

  • 2x² + 7x - 15 = 0

It has roots r and s.

We know how to find the sum and product of roots.

<u>Sum of roots:</u>

  • r + s = -7/2

<u>Product of roots:</u>

  • rs = -15/2

<u>Use the above two equations to work out the value of r - s:</u>

  • r - s = \sqrt{(r - s)^2}  =
  • \sqrt{(r+s)^2-4rs} =
  • \sqrt{(-7/2)^2-4(-15/2)} =
  • \sqrt{169/4} =13/2

Correct choice is B

Brums [2.3K]3 years ago
3 0

Answer:

D is the correct answer

Step-by-step explanation:

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One of the angles formed by two intersecting lines measures 42°. What are the measures of the other three angles
noname [10]

Answer:

To make it easier, I'm gonna label each angle. Let's say that the angle you already know is angle A.

Angle A: 42

Angle B: 138

Angle C: 42

Angle D: 138

Step-by-step explanation:

If this isn't the kind of answer you needed, let me know.

5 0
3 years ago
How much is a 15-percent down payment on a purchase price of $205,000?
schepotkina [342]

Answer: Option (C) is the correct answer.

Step-by-step explanation:

Amount of purchase is give as $205,000.

We have to calculate 15% of $205,000. The value 15% can be written as follows.

                  15% = \frac{15}{100}

or,                      0.15

Thus, calculate the 15% of $205,000 as follows.

                              0.15 × 205,000

                              = 30,750

Thus, we can conclude that $30,750 is the 15-percent down payment on a purchase price of $205,000.

6 0
3 years ago
The speed of light in a vacuum is about 3000000000 meters per second, which can be written as 3 x 10n meters per second. What is
Gala2k [10]

Answer:

n = 9.

Step-by-step explanation:

There are 9 0's after the 3 so it's

3 x 10^9.

6 0
3 years ago
Help pls i beg!!
vichka [17]

Answer:

Third option

Step-by-step explanation:

the difference between the areas of the square and the 4 circles:

the square is 8 inches per side

(8)^{2} -4\pi (2)^{2} =64-4\pi (4)=(64-16\pi)in^{2}

Hope this helps

6 0
2 years ago
(3.56 × 102) + (2.17 × 104) in scientific notation
Brrunno [24]

Answer:

5.888 * 10^2

Step-by-step explanation:

3.56*102=363.12

2.17*104= 225.68

363.12+225.68= 588.8

5 0
3 years ago
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