# 15 22 points previous answers scalcet7 34081 a

• Homework Help
• 11
• 94% (31) 29 out of 31 people found this document helpful

This preview shows page 10 - 11 out of 11 pages.

15.2/2 points |Previous AnswersSCalcET7 3.4.081.A Cepheid variable star is a star whose brightness alternately increases and decreases. For a certainstar, the interval between times of maximum brightness is6.1days. The average brightness of this staris4.0and its brightness changes by±0.55. In view of these data, the brightness of the star at timewheretis measured in days, has been modeled by the function(a) Find the rate of change of the brightness aftertdays.B(t) =4.0+0.55sin.2πtt,6.1
(b) Find, correct to two decimal places, the rate of increase afterfivedays.Solution or ExplanationClick to View Solution=0.240.24dBdt
12/14/16, 4(11 PMhw12S3.4Page 11 of 1116.4/4 points |Previous AnswersIf we plot the points(x,y)satisfying the equationx24+y2= 1, the result is an ellipse. This ellipse ispictured, along with a line that is tangent to the ellipse atPand passes through the pointQ=(4,0).The equation of the line is:y=\$\$123x +\$\$123+32.
End of preview. Want to read all 11 pages?