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.
20/8 is 2.5, but you can't have half of a van, so you would 3 vans to fit all 20 people
Answer:
y=px^2/4
Step-by-step explanation:
The fourth answer is correct, the rest are incorrect.
Answer:
20,000 cm³
Step-by-step explanation:
The shape is a triangular prism
Base area × height
½ × 20 × 25 × 80
20,000 cm³