On a multiple choice test, you earn 2 points for each correct answer, 1 point for every question left blank, and you lose a point for every incorrect answer. Let C be the number of correct
answers, B be the number of questions left blank, and W be the number of incorrect answers.
a) Write an expression for a student's total score. Identify the coefficients and variables in each
term.

b) What type of polynomial is this mk

2c+b-w   It is a trinomial.

Step-by-step explanation:

Making the equation is pretty easy. Since you get 2 points for corrent answers, we can write down 2c. You get one point for blank, so you can write down 1b, or just b. And, since you get -1 point for each incorrect answer, you can write down -1w, or just -w.

So, if you put the equation together, you will get 2c+b-w for the equation.

Since this equation have 3 terms (2c, b, and w) seperated by the + and -, we know that it is a trinomial.

For this case, the first thing you should do is multiply the rate of decrease by time.
 We have then:
 (3.6 × 10-2) * (1.8 × 104)
 = 648 mm
 We are going to convert this number into scientific notation:
 = 6.48 * 10 ^ 2 mm
 Rounding we have:
 = 6.5 * 10 ^ 2 mm
 
 The water level in the tank decreases in 6.5 * 10 ^ 2 millimeters in 5 hours