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Scorpion4ik [409]
2 years ago
13

Use any method you like to find the measure of angle A

Mathematics
1 answer:
lutik1710 [3]2 years ago
4 0
A = 71.5 degrees (1 dp)

cos(A) = (21^2 + 16^2 - 22^2) / (2 x 21 x 16)
= 0.31696...
A = cos^-1(0.31696...) = 71.5 degrees
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Y=3x+14<br> 2x-3y=-14<br> Substitution method
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Answer:

x = -8

Step-by-step explanation:

y = 3x + 14

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So, what is the substitution? Y of course, this is because y is equal to 3x + 14.

2x - 3 (3x + 14) = -14

Multiply 3 with the numbers in the parentheses.

2x - 9x + 42 = -14

So you maybe be wondering why it is a negative 7 instead of subtracting 9 with 2. Using PEMDAS, we always read from left to right. So it is basically 2 -9 and you get -7.

-7x + 42 = -14

Then subtract 42 from both sides.

-7x + 42 - 42 = -14 - 42

Simplify

-7x = -56

Divide 7 by both sides.

-7x / 7 = -56 / 7

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And you might ask, why we get x instead afterwards. This is because both -7 and 7 cancel each other out leaving us with x.

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2 years ago
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The number 1/5 is which type of number?
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In order to clear out room for new merchandise, James decided to mark down some of the items for sale in his electronics store.
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