I am less than 100. I am an even number. I am a multiple of 5. I am divisible by three. The sum of my digits is an even number.

Me because some of question i don’t understand

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.