In a survey of 400 students, 80% said they had math homework every night. Of these, 40% had writing homework every night. How many students had both math and writing every night?

A. 50

B. 128

C. 160

D. 320

How do you find sin 30 of a unit circle?

A new car worth 25,000 is depreciating (loses value) in value by 1,250 per year. Determine how many years will it take for the car to be worth 8,500

If two of a triangle's angles measure 42 and 48 how would you classify that triangle? Write acute, obtuse, right

Simplify 5.3-2.8x-7.1+3.9x

Write the fraction as a mixed number/with 31/6

Find the value of y when x=2 - x - (-2) = y

In a group of 21 students, 8 students take Art courses, 7 students take Music courses. Two students take both courses. A student is chosen randomly from this group. What is the probability that the student takes either Art or Music courses? 57

5% of what number is 63?

Find the sum of the "n" terms of the series: Sn=1²+3²+5² + ... + (2n-1) ²

Aimee's karate class last 1 hour and 15 minutes and is over at 5:00 pm. what time does Aimee's karate class start?