The fist, second and third grade students went on a field trip. there were 227 third grade students and 262 fourth grade students. a total of 756 students went on the trip. how many first grade students went on the trip?

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

The average daily maximum temperature for laura’s hometown can be modeled by the function f(x)=4.5sin(πx/6)+11.8 , where f(x) is the temperature in °c and x is the month. x = 0 corresponds to january.what is the average daily maximum temperature in may? round to the nearest tenth of a degree if needed.use 3.14 for π .

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18