Answer:
C. Cubic expression.
Step-by-step explanation:
The highest exponent is 3 ( in the term 7x^3) so it is cubic.
Answer:
y = 2 
Step-by-step explanation:
The exponential function is of the form
y = a 
To find a and b substitute the given points into the equation
Using (0, 2), then
2 = a
⇒ a = 2
Using (1, 6), then
6 = 2
⇒ b = 3
Equation is y = 2 
Step-by-step explanation:









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79. Set up an equation to solve this problem. Suppose she needs at least a score of x points. Her current total scores is 89+65+68+88=310. Her total score will be 310+2x (since final exams counts as two tests). The average score is total points divided by number of tests, and it has be bigger or equal to 78, so (310+2x)/6>=78. We solve it and get x=79. She has to score at least 79 on her final exam in order to jhave an overall average of 78.