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Zigmanuir [339]
2 years ago
5

Explain why cos(x)=sin(90-x) for x such that 0

Mathematics
1 answer:
aleksley [76]2 years ago
8 0
Use the sin(a - b) formula. 
<span>sin(90 - x) = </span>
<span>sin90 cosx - cos90 sinx = </span>
<span>1 cosx - 0 sinx = </span>
cosx
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Generate equivalent fractions
padilas [110]
1/2 = 36/72
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3 years ago
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Find the equation of the line through the points (-2,1) and (5,-20)
ankoles [38]

Answer:

y = -3x - 5

Step-by-step explanation:

First find the slope:  (-20 - 1) / (5 - (-2))  = -3

Then plug in one set of points into the equation y = mx + b.

1 = -3(-2) + b

1 = 6 + b

b = -5

So you can get the equation:  y = -3x - 5

5 0
2 years ago
Which answer is the equation of the line represented in function notation?
blagie [28]

Answer: f(x)=3/2×-2

Step-by-step explanation:

3 0
3 years ago
A circular plate has circumference 21.4 inches. What is the area of this​ plate? Use 3.14 for pi. The area of this plate is abou
kolezko [41]

Answer: Area of circular plate is 36.5 square inches

Step-by-step explanation:

The formula for determining the circumference of a circle is expressed as

Circumference = 2πr

Where

r represents the radius of the circle.

π is a constant whose value is 3.14

From the information given,

Circumference of circular plate = 21.4 inches. Therefore

2 × 3.14 × r = 21.4

6.28r = 21.4

r = 21.4/6.28

r = 3.41 inches

The formula for determining the area of a circle is expressed as

Area = πr²

Area of circular plate = 3.14 × 3.41² = 36.5 square inches

8 0
3 years ago
A field has 25 trees in it . 14 trees are new and the rest are old . How many trees are old ? Write two different equations that
mamaluj [8]

Answer:

An equation would be 24 - 14 = n. Another one you could write would be 14 + n = 24. The answer is 10 for the amount of old trees.

5 0
2 years ago
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