Its for an exam i really need help

Sum of the interior angles of any triangle equal 180°

So :

A + B + C = 180°

A + 70° + 90° = 180°

A + 160° = 180°

Subtract sides -160°

A = 180° - 160°

A = 20°

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According to the case of Sine we have :

Thus ;

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Sin ( 90° ) = 1

Sin ( 20° ) = Cos ( 70° ) = 0.34

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Multiply sides by 0.34

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And we're done...

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c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !