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Allushta [10]
4 years ago
9

John starts a saving account with $100. Every week he adds $6 to his account. Which equation can be used to determine the number

of weeks w, after which John's accounts reaches $220?
A)6w + 100 = 220
B)6w - 100 = 220
C)6w + 220 = 100
D)6 + w = 220
Mathematics
1 answer:
ladessa [460]4 years ago
8 0
A is right because the 100 stays the same since you start out with it and you add the 6 multiplied by x depending on the number of weeks it takes to reach 220.
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Write the left side of the given expression as N/D, where
N = sinA - sin3A + sin5A - sin7A
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We shall use these identities:
sin x - sin y = 2cos((x+y)/2)*sin((x-y)/2)
cos x - cos y = -2sin((x+y)/2)*sin((x-y)2)

N = -(sin7A - sinA) + sin5A - sin3A
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D = cos7A + cosA - (cos5A + cos3A)
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Therefore
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