One disadvantage of using a survey to gather data for psychological purposes is the fact that it can be . A.
an inefficient data collection tool
B.
only used to gather unobservable information
C.
difficult to use for research purposes
D.
potentially unreliable or invalid

Idon’t understand your question, can you clear it up?

To solve this integral, what you can do is split it up as follows: (1) ∫40(x2−4)dx=∫40(x2)dx−∫40(4)dx. to integrate  4  as an  indefinite integral, a good rule of thumb is  by  an equation below  for  polynomials; . (2) ∫xa=xa+1a+1+c , where a is any number. c denotes some constant that is crucial when doing 

Difficulty getting a loan or credit cardan increase in debtdifficulty keeping assetsa loss of moneydifficulty landing a new job