On a multiple choice test, you can I point for each correct answer and the lose 2 points for each incorrect answer. a. Write an expression for a student's total score.

b. Tim answered 22 questions correctly and 3 incorrectly. Find Tim's score.

Part A

I'm assuming you meant to say "you can get 1 point for each correct answer".

x = number of correct answers

y = number of incorrect answers

1x = points from the correct answers

2y = points you lose from the incorrect answers

1x-2y = total points

Part B

Tim got x = 22 questions correct and y = 3 incorrect.

So,

x-2y = 22-2*3 = 22-6 = 16

Side note: If Tim got a score of 16 out of 22+3 = 25, then the percentage is 16/25 = 0.64 = 64%. It appears that getting even a few wrong answers takes a pretty hefty toll on the final percentage.

Below!

Solution for Part A:

To create an expression for this, we will need to recall:

Using these clues, we know that the expression is c - 2w.

Solution for Part B:

We know that:

Work:

Hence, Tim earned 16 points in total.

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

34.5 cm

step-by-step explanation:

generally for a circular segment of angle, θ° and radius r

arc length

= (θ/360) x circumference

= (θ/360) x 2πr

in our case, θ = 60°, π=3.142 and r = 33 cm

substitute into above formula

arc length

= (60/360) x 2(3.142)( 33) = 34.5 cm