exam Maths Puzzle Numerical Ability

Graph the ellipse, then choose the correct foci.
x^2 + 25y^2 = 100

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(1 dived by 5)5 times 14 Can anyone help? "Alvin has scores of 94, 80, 89, and 92 on his first four exams in a symbolic logic class. If the fifth test is the last test, what must he score on the fifth test to have an overall average of 90?" Thank you.