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GreenHerbz206
13.12.2019 •
Mathematics
For parametric equations x= a cos t and y= b sin t, describe how the values of a and b determine which conic section will be traced.
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Ответ:
Step-by-step explanation:
x = a cos t, y = b sin t
cos t = x / a, sin t = y / b
cos² t + sin² t = 1
(x / a)² + (y / b)² = 1
If a = b, the conic section is a circle.
If a and b are different, the conic section is an ellipse.
Ответ:
$47.66
Step-by-step explanation:
The cost of the sweater is calculated by multiplying .7 x $35. (70% represents the cost of the sweater since there is a 30% discount.). The sweater cost $24.50.
The cost of the jeans is .85 x $28 = $23.80.
The total cost is $24.50 + $23.80 = $43.80.
The tax rate is 8%, which is calculated by multiplying .08 x $43.80 = $3.86 in sales tax.
Including the sales tax, the total cost is $43.80 + 3.86 = $47.66