B. the tip was 1/20 of the meal cost.
4 1/2
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The equation of the parabola is y = 5x² - 11x - 31
<h3>Parabola</h3>
The equation of a parabola is a quadratic equation in the form:
y = ax² + bx + c
Where a, b and c are constants.
At point (2, - 33):
- -33 = a(2)² + b(2) + c
- 4a + 2b + c = -33 (1)
At point (4, 5):
- 5 = a(4)² + b(4) + c
- 16a + 4b + c = 5 (2)
At point (5, 39):
- 39 = a(5)² + b(5) + c
- 25a + 5b + c = 39 (3)
Solving equation 1, 2 and 3 simultaneously gives:
a = 5, b = -11, c = -31.
The equation of the parabola is y = 5x² - 11x - 31
Find out more on parabola at: brainly.com/question/4148030
Answer:
0.070 is the standard error of the mean weight in estimating a confidence interval estimate
Step-by-step explanation:
We are given the following in the question:
Sample mean, = 2.00 ounces
Sample size, n = 71
Alpha, α = 0.05
Population standard deviation, σ = 0.590 ounces
Formula for standard error =
Putting values, we get,
Thus, 0.070 is the standard error of the mean weight in estimating a confidence interval estimate
Answer:
7.5 ft²/student
Step-by-step explanation:
This is a "unit rate" problem.
30 ft²
------------------ = 7.5 ft²/student
4 students
Each student will paint 7.5 ft² of the wall.