Sin²x + cos²x = 1
Cos²x = 1-sin²x ----> 1️⃣
Sin²x = 1-cos²x ----> 2️⃣
Exact form: 39/4
decimal form: 9.75
mixed number: 9 3/4
<span>N + D = 55 coins (1) (N stands for nickels,
5N + 10D = 390 cents (2) D stands for dimes)
Simplify (2) by canceling the factor 5 in both sides:
N + 2D = 78 (3)
Subtract eq(1) from eq(3). You will get
D = 78 - 55 = 23.
Answer. 23 dimes and 55-23 = 32 nickels.
Check. 23*10 + 32*5 = 390 cents</span>
Answer:
The coordinate r is the length of the line segment from the point (x,y) to the origin and the coordinate θ is the angle between the line segment and the positive x-axis.
Step-by-step explanation:
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Answer:
go back and try agian good
Step-by-step explanation:
