3 years ago

Whoever answers this correctly gets brainliest

Mathematics

1 answer:

ELEN [110]3 years ago

5 0

Answer: 11. Is A

Step-by-step explanation:

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Given cos = -2/5 a in quadrant III and cos b = 1/4, b in quadrant I find

BigorU [14]

I guess you mean $\cos a=-\dfrac25$ . Since $a$ is in quadrant III, we expect $\sin a$ . Then

$\sin a=-\sqrt{1-\cos^2a}=-\dfrac{\sqrt{21}}5$

Since $b$ is in quadrant I, we expect $\sin b>0$ , so that

$\sin b=\sqrt{1-\cos^2b}=\dfrac{\sqrt{15}}4$

Now,

$\sin(a+b)=\sin a\cos b+\cos a\sin b=-\dfrac{2\sqrt{15}+\sqrt{21}}{20}$

$\cos(a+b)=\cos a\cos b-\sin a\sin b=\dfrac{3\sqrt{35}-2}{20}$

and

$\tan(a+b)=\dfrac{\sin(a+b)}{\cos(a+b)}=-\dfrac{2\sqrt{15}+\sqrt{21}}{3\sqrt{35}-2}$

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4 years ago

the equation of a line is y = 3. write an equation in slope-intercept form of a line parallel to y = 3 that passes through (0, 6

Pavel [41]

Parallel lines have equal gradients;
Gradient of line 2 is thus 0
y=c
Replacing value of y=6 gives
c=6
Equation of the line is thus y=6

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3 years ago

Sheila eats 3/4 of a bag of carrots each week, how many bags of baby carrots does she eat in 6 weeks? Write in simplest form

Alla [95]

3/4 x 6 = 18/4 = 4 1/2

she eats 4 1/2 bags of carrots in 6 weeks

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3 years ago

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To win at LOTTO in one state, one must correctly select 7 numbers from a collection of 48 numbers (1 through 48). The order in w

sashaice [31]

Answer:

See below.

Step-by-step explanation:

This is the number of permutations of 7 from 48.

= 48! / (48-7)!

= 48! / 41!

= 3.71090523 * 10^11.

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3 years ago

I need help pls ASAP !!<br> (Extra points)<br><br> & explanation

sergey [27]

Answer:

x = 60

Step-by-step explanation:

Total degrees of all interior angles (the three angles inside the triangle) is always 180°

So u use 180/3 = 60 which is x

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3 years ago