7. A teacher calculated her students' grades for the last grading period. The circle graph shows the letter grades and the percentage of students receiving that letter grade for the grading period. Student Grades D (70-74) 16% B (80-89) 48% C (75-79) 12% A (90-100) The teacher has a total of 125 students. How many students earned an A (90-100)?​

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints