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Novay_Z [31]
3 years ago
5

I could really use some help!! (it also needs to be correct!!)​

Mathematics
1 answer:
OverLord2011 [107]3 years ago
7 0

Answer:

X=13

Step-by-step explanation:

First I squared 12 and 5 and got 144 and 25 then I added them which was a total of 169 then I took the square root of 169 and got x=13.

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17. Solve the following:<br> x – 3y = 5<br> 5x – 2y = -1
Phantasy [73]

Answer:

(- 1, - 2 )

Step-by-step explanation:

Given the 2 equations

x - 3y = 5 → (1)

5x - 2y = - 1 → (2)

Rearrange (1) expressing x in terms of y by adding 3y to both sides

x = 5 + 3y → (3)

Substitute x = 5 + 3y in (2)

5(5 + 3y) - 2y = - 1 ← distribute left side

25 + 15y - 2y = - 1

25 + 13y = - 1 ( subtract 25 from both sides )

13y = - 26 ( divide both sides by 13 )

y = - 2

Substitute y = - 2 in (3) for corresponding value of x

x = 5 + (3 × - 2) = 5 - 6 = - 1

Solution is (- 1, - 2 )

8 0
3 years ago
Simplify the expression using trigonometric identities: sec (–θ) – cos θ.
ololo11 [35]

Answer:

sin θ . tan θ

Step-by-step explanation:

Note : -

sec ( - θ ) = sec θ

Formula / Identity : -

sec θ = 1 / cos θ

sec ( - θ ) - cos θ

= [ 1 / cos θ ] - cos θ

{ LCM = cos θ }

= [ 1 / cos θ ] - [ cos²θ / cos θ ]

= [ 1 - cos²θ ] / cos θ

{ 1 - cos²θ = sin²θ }

= sin²θ / cos θ

{ sin²θ = sin θ . sin θ }

= sin θ . sin θ / cos θ

{ sin θ / cos θ = tan θ }

= sin θ . tan θ

Hence, simplified.

4 0
2 years ago
mr kato's closet contains 10 neckties there is ratio of 2 neckties to 3 shirts in the closet how many shirts does mr kato have i
slega [8]
10 divided by 2=5
5 times 3 is 15
15 shirts
8 0
3 years ago
A circle has a diameter of 42 cm. Find
KATRIN_1 [288]

I think your answer should be 100 cm...

Hope this helps

8 0
3 years ago
Pls solve this question​​s 4and 5​​​
Viktor [21]

Answer:

86km/h

80km/h

Step-by-step explanation:

weighted average

bus took 5hrs so van took 3.75 hrs

300/3.75

6 0
2 years ago
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