First question
42 students
Second question 65%
Are you sure this is written correctly? Any number whose digits add to 9 is divisible by 9. For a 2 digit number then, your choices are
18, 27, 36, 45, 54, 63, 72, and 81. None of these has the property that for the 2 digit number AB that B=2A-1. Solving your question algebraically is possible but you get fractional digits.
The diagonals intersect perpendicularly, two consecutive angled are supplementary, and that opposite angles are equal
Answer:
$105 interest
Step-by-step explanation:


Interest = $105
Answer:
15n
Step-by-step explanation:
Since it is 15 samples per day, you just need to multiple 15 by the number of days.