For question #3, I have tried answering 3.4286, 6.07, and 3.92. However, it says that all are incorrect please help!

My Not 3. 0/5 points Previous Answers SCalcET8 8.PP.010. A triangle with area 30 cm2 is cut from a corner of a square with side 10 cm, as shown in the figure. If the centroid of the remaining region is 4 cm from the right side of the square, how far is it from the bottom of the square? 240 70 x cm 10 cm 4. -15 points SCalcET8 10.PP.501.XP A curve is defined by the parametric equations below. sin(udu cos(u) du y x= Find the length of the arc of the curve from the origin to the nearest point where there is a vertical tangent line. 5. +-15 points SCalcET8 11.PP.006 Find the sum of the series 1 5 725 35 49 125 175 where the terms are the reciprocals of the positive integers whose only prime factors are 5s and 7s. My Not 3. 0/5 points Previous Answers SCalcET8 8.PP.010. A triangle with area 30 cm2 is cut from a corner of a square with side 10 cm, as shown in the figure. If the centroid of the remaining region is 4 cm from the right side of the square, how far is it from the bottom of the square? 240 70 x cm 10 cm 4. -15 points SCalcET8 10.PP.501.XP A curve is defined by the parametric equations below. sin(udu cos(u) du y x= Find the length of the arc of the curve from the origin to the nearest point where there is a vertical tangent line. 5. +-15 points SCalcET8 11.PP.006 Find the sum of the series 1 5 725 35 49 125 175 where the terms are the reciprocals of the positive integers whose only prime factors are 5s and 7s