Answer: 4 science questions and 5 math questions
<u>Step-by-step explanation:</u>
To guess, you know that no matter how many 10 point questions you answer, the result will end in a zero. The number given is 85 so find a number you can multiply by 9 that ends in a 5. Answer: 9(5) = 45
The remaining points (40) are divisible by 10.
40 ÷ 10 = 4
Check: 5 (9-point questions) + 4 (10-point questions) = 9 total questions
45 points + 40 points = 85 points
Note that this problem can be solved mathematically by setting up a system of equations:
Points: 9x + 10y = 85
Quantity: x + y = 9
36/10 is 36 divided by 10
So, you would divide 36 by 10 and as
36 = 36.000...
You would move the decimal place one place to the left.
3.6000... = 3.6
(1, 0) and (0, -2)
slope = (0 + 2)/(1 - 0) = 2/1 = 2
the slope is m = 2
the y intercept is b = -2