Which of the equations is the correct representation of the following word problem A student has two grades of 80 and 90. what grade must the students make on the next test to pass the class with a 90 grade average?

(80+90+n)/3=100

(80+90+90)/3=y

(80+90+z)/3z=90

+80+90+x)/3=90

Can anyone me with 32,33,36,37,and 40.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min. if they did not stop driving, how many miles could kyle and elijah drove in a whole day? ? 1 day = 24 hours. plzzz write a proportion i will give you 100 points