Four polynomials are shown below:
a. 4 − 7x5 + x2
b. 5x3 + 5 − 3x4
c. 3x + 2x4 − x2 + 6
d. 3x3 − 5 + 2x5 + x
which of the above polynomials is a 4th degree trinomial?

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

Having a hard time understanding this question (see attachment).

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)