3 years ago

Change 8.6 x 10^-4 to decimal notation

Mathematics

1 answer:

Bezzdna [24]3 years ago

3 0

Answer: 0.0086

Step-by-step explanation:

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HELP <3 Match the expressions with their solutions.

densk [106]

Answer:

1 ) sin 165°

2 ) cos 330°

3 ) Tan 157.5°

4 ) $sin^2 157.5$

Step-by-step explanation:

1 )

Given expression is $\sqrt{\frac{1-cos330}{2} }$

We know that $cos2x=1-2sinx^{2}$

$sinx^{2}=\frac{1-cos2x}{2}$

$(sinx/2)^2=\frac{1-cosx}{2}$

So the first expression is sin (330/2)° =sin 165°

2 )

GIven expression is $1-2sin^2165$

We know that $cos2x=1-2sinx^{2}$

So the result is cos 330°

3 )

Given expression is $\frac{1-cos 315}{sin315}$

We know that $cos2x=1-2sinx^{2}$

Also we know that sin2x = 2sinxcosx

So The numerator becomes $2sin^2x/2$ . and the denominator becomes as $2sinx/2cosx/2$

$\frac{2sin^2x/2}{2sinx/2cosx/2}=tanx/2$

So the result is Tan 157.5°

4 )

Given expression is $\frac{1-cos 315}{2}$

We know that $cos2x=1-2sinx^{2}$

$(sinx/2)^2=\frac{1-cosx}{2}$

So the result is $sin^2 157.5$

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3 years ago

Question 5 (1 point) The line whose equation is y = 4x + 2 has a y-intercept whose coordinates are

11111nata11111 [884]

Answer: 2xy

Step-by-step explanation:

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8_murik_8 [283]

The answer would be D

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There are 24 kids in Hillary’s fourth grade class. 3/4 of the class is male. How many girls are there in Hillary’s class?

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Navy sold a house for $225.900 and earned 4% commission how much did Macy earn for the sale of this house?

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