3 years ago

In triangle ABC, angle C is a right angle. If cos A = 5 8, what is the value of cos B?

Mathematics

1 answer:

Svetradugi [14.3K]3 years ago

3 0

Answer:

Step-by-step explanation:

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Alex73 [517]

Answer:

2×5×7+2×5×2+2×7×2

70+20+28

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3 years ago

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True or false. -5+ ( -3 +( -8) = -5 + ( - 3 + 8 )

ivanzaharov [21]

False:

-5 + -3 + (-8) = -16

-5 + -3 + 8 = 0

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5. =14
6. =17

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3 years ago

33° (3m + 3) ent OR Vertical_ Angle Relationship: Complementary OR Supplementary

Reptile [31]

Answer:

complementary

Step-by-step explanation:

because the angles add up to 90°

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3 years ago

A line passes through the points (–1, –5) and (4, 5). The point (a, 1) is also on the line.

IgorC [24]

Answer:

a = 2

Step-by-step explanation:

Let's find the equation of the line using the 2 points given.

Let's call -1 as x_1 and -5 as y_1

also, 4 as x_2 and 5 as y_2

The equation of line is :

$y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)$

Let's plug the points and get the equation of the line:

$y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)\\y+5=\frac{5+5}{4+1}(x+1)\\y+5=2(x+1)\\y+5=2x+2\\y=2x-3$

Now, to find a, we substitute a in x and 1 in y of the equation of the line we just got:

$y=2x-3\\1=2(a)-3\\1=2a-3\\2a=4\\a=\frac{4}{2}=2$

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3 years ago

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