Answers to questions 15,19,20,21 &25

Mathematics

1 answer:

GarryVolchara [31]3 years ago

7 0

Answer:

The answer to your question is below

Step-by-step explanation:

15. x² = 144

x = √144

x = ± 12

19. 9x² = 4

x² = 4/9

x = √4/9

x = ± 2/3

20.

25y² = -16

y² = -16/25

y = √-16/25

y = ± 4/5 i

21. 16y² = 25

y² = 25/16

y = √25/16

y = ±5/4

25.

81 - 9x² = 0

81 = 9x²

81/9 = x²

9 = x²

√9 = x

x = ± 3

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fran has 7 sheets of paper for coloring projects if she only uses one third of a sheet of paper per drawing how many drawings ca

Katarina [22]

If she uses 1/3 of a sheet of paper for drawing and she has 7 sheets, you do 7x3 and get 21, 21 drawings.

3 0

4 years ago

BRAINLIEST ASAP! PLEASE HELP ME :)

Likurg_2 [28]

Answer:

$\large \boxed{41^{\circ}}$

Step-by-step explanation:

∠1 = ∠2

∠3 = ∠4

∠JKN = ∠1 + ∠2 = 8x + 2

∠MKN = ∠3

∠MKL = ∠4 = 3x + 5

So, ∠3 = 3x + 5

$\begin{array}{rcll}(\angle 1 + \angle 2) + \angle 3 + \angle 4 & = & 180 & \text{$\vec{KJ}$ and $\vec{KL}$ are opposite rays}\\8x + 2 + 3x + 5 + 3x + 5 & = & 180 & \text{Made the substitutions}\\14x + 12 & = & 180 & \text{Simplified}\\14x & = & 168 &\text{Subtracted 12 from each side}\\x & = & \mathbf{12} & \text{Divided each side by 14}\\\angle3 & = & 3x + 5 & \\& = & 3(12) + 5 & \\& = & 36 + 5 & \\& = & \mathbf{41} & \\\end{array}\\m\angle MKN = \large \boxed{\mathbf{41^{\circ}}}$