Mathematics, 24.08.2019 04:20 Sadiecoyle37

What two numbers add up to 39 and multiply to -880?

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Answer from: ElDudoso

X + y = 39
xy = -880

x + y = 39
x - x + y = -x + 39
y = -x + 39

  xy = -880
  x(-x + 39) = -880
  x(-x) + x(39) = -880
-x² + 39x = -880
-x² + 39x + 880 = 0
-1(x²) - 1(-39x) - 1(-880) = 0
  -1(x² - 39x - 880) = 0
  -1 -1
  x² - 39x - 880 = 0
  x² - 55x + 16x - 880 = 0
x(x) - x(55) + 16(x) - 16(55) = 0
x(x - 55) + 16(x - 55) = 0
  (x + 16)(x - 55) = 0
x + 16 = 0      or        x - 55 = 0
- 16 - 16 + 55 + 55
  x = -16      or     x = 55

  x + y = 39
  -16 + y = 39
+ 16 + 16
y = 55
  (x, y) = (-16, 55)

or

x + y = 39
55 + y = 39
- 55 - 55
y = -16
(x, y) = (55, -16)

The two numbers that add up to 39 and multiply to -880 are 55 and -16.

Answer from: Quest

9) i can't see the angle so whatever it is just do this: cos(angle) x hypotenuse and then use that answer and they hypotenuse and plug it into this: (answer you just got)^2 + b^2 = (hypotenuse)^2. the first answer will be the answer of the adjacent side and the second answer after this equation will be the opposite side.

10) y = 14 x = √147 or 12.12435565

11) x = 4.8

12) x = 4.2

13) x = 9.3

14) pq: 13.2

qr : 17.6

angle p: 53º

15) angle c: 54.3º

angle a: 35.7º

16) h = 21040

v = 1841

step-by-step explanation:

10) 7/sin(30) = 14 = y

7^2 + b^2 = 14^2

49 + b^2 = 196

b^2 = 196 - 49

√b^2 = √147

x = √147

11) cos(70) x 14 = 4.788282007

x = 4.8

12) tan(25) x 9 = 4.196768923

x = 4.2

13) sin(31) x 18 = 9.270685348

x = 9.3

14) pq: sin(37) x 22 = 13.23993051

pq: 13.2

qr: cos(37) x 22 = 17.56998122

qr : 17.6

angle p: 180 - (37 + 90) = 53º

15) cos-1(7/12) = 54.31466529

angle c: 54.3º

angle a: 180 - (90 + 54.31466529) = 35.68533471

angle a: 35.7º

16) 4 x 5280 = 21120

cos(5) x 21120

h = 21039.63202

h = 21040

sin(5) x 21120

v = 1840.729287

v = 1841

Lots of points! show all of your work! i need #9-#14 and 12 + 16!

Answer from: Quest

answer: 7

step-by-step explanation:

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