Factor the trinomial enter the smallest number first y^2+13a+30

The mean temperature for the first 4 days in january was 7°c. the mean temperature for the first 5 days in january was 5°c. what was the temperature on the 5th day?

What signals you that factoring by grouping is the best method to use when factoring a problem?

Which pair of numbers is relatively prime? a. 105 and 128 b. 130 and 273 c. 205 and 350 d. 273 and 333