An apartment building contains 80 units. Some of these are one-bedroom units renting for $425 per month and some are two-bedroom units renting for $550 per month. When the building is entirely rented, the total monthly rental income is $38,375. How many apartments of each type are there?

Which mathematical statements are true? 1) if 3 is an odd number, then 3 times 3 is an even number. 2) if 6 is less than 7, then 4 is greater than 7. 3) six is divisible by 3, and 10 is a multiple of 2. 4) the average of the data is greater than the largest value in the data, or it’s less than the largest value in the data. 5) the slope of a linear graph is its rate of change, and the graph’s y-intercept is the initial value. 6) if an equilateral triangle has equal angles, then all its angles will measure 45°.