Answer:
-(-q^2/3 +2pq/3 - 1/9)
Step-by-step explanation:
Answer:
The correct answer is: The test had 10 4-point questions and 30 3-point questions.
Step-by-step explanation:
Let t be the number of 3-point questions on the test
and
f be the number of 4-point questions on the test
Then,
According to the given statement that the test had 40 problems
Eqn 1
And
According to given statement that the total points are 130
Eqn 2
These equations form a system of linear equations in two variables.
Elimination method or substitution method can be used to solve the system.
So, from equation 1:
Putting t = 40-f in equation 2
Subtracting 120 from both sides
Putting f = 10 in equation 1
Subtracting 10 from both sides
Hence,
Number of 3-point questions = t = 30
Number of 4-point questions = f = 10
So,
The correct answer is: The test had 10 4-point questions and 30 3-point questions.
Answer:On a graph, these values form a curved, U-shaped line called a parabola. All quadratic functions form a parabola on a graph. ... Quadratic functions are used to describe things with smooth symmetrical curves, like the path of a bouncing ball or the arch of a bridge.
Step-by-step explanation: