Exam Maths Puzzle Percentage

There are a total of 100 bills. In 100 bills, 40 bills were reviewed in which 10 errors were found. This makes the error rate 25%. What is the assumed error rate in the remaining u

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How long would it take to cycle 200 km? Q. These are the hardest questions, I cannot figure them out. Can you help me?

Q. What is the vertex ot the parabola with the equation (y - 1)2 = 4x?

Q. What is the focus of the parabola with the equation (x - 1)2 + 32= 8y?

Q. Find the center of a circle with the equation x2 + y2 + 2x + 4y - 9 = 0.

Q. Find the radius of a circle with the equation x2 + y2 - 6x - 12y + 36 = 0.

Q. Find the center of an ellipse with the equation 9x2 + 16y2 - 18x + 64y = 71.

Q. Find the foci of an ellipse with the equation 7(x - 2)2 + 3(y - 2)2 = 21.

Q. Find the length of the major and minor axes of an ellipse with the equation 16x2 + 25y2 + 32x - 150y = 159.