2 years ago

Make you please help me , i will give you 15 point!

Mathematics

2 answers:

drek231 [11]2 years ago

5 0

Answer: 1/2 x 4

Step-by-step explanation:

eimsori [14]2 years ago

3 0

Answer:

y=-1/2x+4

Step-by-step explanation:

hope this helps:)

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Solve the equation 3x + 5y = 15 for y.

natka813 [3]

Answer:

y = (15-3x)/5

Step-by-step explanation:

3x + 5y = 15

5y = 15 - 3x

y = ( 15 - 3x) /5

8 0

2 years ago

Which expression is equivalent to (1−sinβ)(1+sinβ)/cos2β for all values of β for which (1−sinβ)(1+sinβ)/cos2β is defined?

stealth61 [152]

<h3>Answer: Choice E) 1</h3>

Work Shown:

$\frac{(1-\sin(\beta))(1+\sin(\beta))}{\cos^2(\beta)}\\\\\frac{1-\sin^2(\beta)}{\cos^2(\beta)}\\\\\frac{\cos^2(\beta)}{\cos^2(\beta)}\\\\1\\\\$

Therefore, $\frac{(1-\sin(\beta))(1+\sin(\beta))}{\cos^2(\beta)}=1\\\\$ is an identity for all values of β for which the original expression is defined. I used the difference of squares rule for the 2nd step. Then I applied the pythagorean trig identity for the 3rd step.