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3 years ago

Not sure how to answer question 4

Mathematics

2 answers:

laiz [17]3 years ago

8 0

D = 86
Because its the nearest degree to 90 as you see < BAC seems to be 90

drek231 [11]3 years ago

5 0

Answer:

<em>Option D is correct</em>

Step-by-step explanation:

Applying the cosine theorem for triangle ABC, you would have:

cos (angle BAC) = (BA^2 + CA^2 - BC^2)/(2*BA*CA)

= (10^2 + 18^2 - 20^2)/(2*10*18)

= 24/360

=> angle BAC = ~86 deg

Hope this helps!

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3 years ago

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2 years ago

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2 years ago

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valina [46]

Answer:

The sum of the given series is 1023

Step-by-step explanation:

Geometric series states that a series in which a constant ratio is obtained by multiplying the previous term.

Sum of the geometric series is given by:

$S_n = \frac{a(1-r^n)}{1-r}$

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2 years ago

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