3. Types of study that is most suitable when we have very few samples is: a. Experimental Study
b. Case Study
c. Cross-sectional study
d. Longitudinal study
what would be the answer please?​

The function p(x) is an odd degree polynomial with a negative leading coefficient. if q(x) = x3 + 5x2 - 9x - 45, which statement is true? a. as x approaches negative infinity, p(x) approaches positive infinity and q(x) approaches negative infinity. b. as x approaches negative infinity, p(x) and q(x) approach positive infinity. c. as x approaches negative infinity, p(x) and q(x) approach negative infinity. d. as x approaches negative infinity, p(x) approaches negative infinity and q(x) approaches positive infinity.