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Serjik [45]
2 years ago
7

NEED HELP ASAP! WILL MARK BRAINLIEST!!!

Mathematics
1 answer:
Tpy6a [65]2 years ago
7 0

Answer:

Andrew: 6.25 days

Bailey: 25 days

Step-by-step explanation:

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HELp meh with this question it very hard
Dovator [93]

Answer:

  • AB = 7 cm

Step-by-step explanation:

<u>Use the law of cosines to find the side AB:</u>

  • AB = \sqrt{(x + 3)^2+x^2-2x(x+3)cos (60)} =
  • \sqrt{x^2+6x+9+x^2-x^2-3x}  = \sqrt{x^2+3x+9}

<u>Use the Heron's area formula next:</u>

  • A = \sqrt{s(s - a)(s-b)(s-c)}, where s- semi perimeter
  • s = 1/2[x + x + 3 + \sqrt{x^2+3x+9}) = 1/2 (2x + 3 + \sqrt{x^2+3x+9})
  • s - a = 1/2 (2x + 3 + \sqrt{x^2+3x+9} - 2x - 6) = 1/2 (\sqrt{x^2+3x+9 } - 3)
  • s - b = 1/2 (2x + 3 + \sqrt{x^2+3x+9} - 2x) = 1/2 (\sqrt{x^2+3x+9} + 3)
  • s - c = 1/2 (2x + 3 + \sqrt{x^2+3x+9} - 2\sqrt{x^2+3x+9}) = 1/2 (2x + 3 - \sqrt{x^2+3x+9})

<u>Now</u>

  • (s - a)(s - b) = 1/4 [(x²+3x+9) - 9] = 1/4 (x² + 3x)
  • s(s - c) = 1/4 [(2x + 3)² - (x² + 3x + 9)] = 1/4 (3x²+ 9x) = 3/4(x² + 3x)

<u>Next</u>

  • A² = 3/16(x² + 3x)(x² + 3x)
  • 300 = 3/16(x² + 3x)²
  • 1600 = (x² + 3x)²
  • x² + 3x = 40

<u>Substitute this into the first equation:</u>

  • AB = \sqrt{40 + 9} = 7 cm

4 0
3 years ago
Which of the following lies in first quadrant
Doss [256]

Answer:

B

Step-by-step explanation:

First quadrant always has a positive and a positive

5 0
2 years ago
Read 2 more answers
Difference between DIRECT and INDIRECT ratio?​
MakcuM [25]

Step-by-step explanation:

In a direct proportion, the ratio between matching quantities stays the same if they are divided. (They form equivalent fractions). In an indirect (or inverse) proportion, as one quantity increases, the other decreases.  In an inverse proportion, the product of the matching quantities stays the same.

8 0
2 years ago
Read 2 more answers
When asked to compare -9 and positive 2 Joshua wrote -9 &gt;2 Joshua correct? If not explain and correct his error
morpeh [17]

Answer:

-9 < 2

Step-by-step explanation:

-9 is a negative number

2 is positive number

and of course -9 is smaller or < than 2

This means he is wrong becuase this symbol > means greater

He should correct it to -9 < (less) than 9

Hope this help you :3

8 0
3 years ago
Jeremiah built a box that was 5 inches long by 6 inches wide by 7 inches high .he started filling it up with 1 cube.he realized
Degger [83]
To determine the number of cubes he needs to fill the box (this is assuming the cubes are 1 in cubes, he would need to calculate the volume of the box. To find the volume he would multiply the length by the width by the height. This would be 5 in x 6 in x 7 in. The volume is 210 cubic inches, so he could fill it with 210 one inch cubes.
3 0
3 years ago
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