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)?

What is the value of x when x + 7 = 21?

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?

Find the derivative of the function