D. You start out with $500, it does not use a variable, knocking out a and b. Also, you need at least the needed amount of money, so b or c cannot be the answer. This only leaves d.
It is often easiest to use "military time". That is, add 12 to all the afternoon numbers and do the subtraction in the usual way. Of course, 1 hour = 60 minutes, so 10 minutes = 10/60 hour = 1/6 hour.
Mon: 15:10 -8:00 = 7:10 = 7 1/6
Tue: 15:25 -8:05 = 7:20 = 7 1/3
Wed: 14:30 -8:00 = 6:30 = 6 1/2
Thur: 14:45 -7:55 = 7:(-10) = 6:50 = 6 5/6
Fri: 15:38 -7:58 = 8:(-20) = 7:40 = 7 2/3
_____
Some calculators have nice features for working with degrees, minutes, and seconds. In this context, degrees and hours are the same thing. That is, the base-60 arithmetic is the same whether you consider the numbers to be hours or degrees. Similarly, some calculators convert nicely between decimal fractions and mixed numbers. In short, a suitable calculator will almost do this math for you. (You just need to add 12 to all the numbers in the column on the right.)
Answer:
Step-by-step explanation:
x + y + z = 1
-x + 9y - 3z = -49
10y - 2z = -48
2x + 4y + 2z = -6
-2x + 18y - 6z= -98
22y - 4z = -104
-20y + 4z = 96
2y = -8
y = -4
10(-4) - 2z = -48
-40 - 2z = -48
-2z = -8
z = 4
x - 4 + 4 = 1
x = 1
x = 1, y = -4, z = 4
Answer:
3 - x/12
Step-by-step explanation:
follow the steps in the sentence
The right answer is probably C
