Find a and d for the function f(x) = a cos(x) + d

Evaluate the following expression 1/3^2

Landon wrote that 3−2.6=4. which statement about his answer is true?

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )