Answer:
Grade D score:

Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 78.8
Standard Deviation, σ = 7.1
We are given that the distribution of scores on test is a bell shaped distribution that is a normal distribution.
Formula:

D: Scores below the top 77% and above the bottom 9%
We have to find the value of x such that the probability is 0.77
Calculation the value from standard normal z table, we have,
We have to find the value of x such that the probability is 0.09

Calculation the value from standard normal z table, we have,
Thus, the numerical value of score to achieve grade D is

47 and 48 are the integers.
Step-by-step explanation:
Let,
x and x+1 be the integers, therefore, according to statement;

2nd Integer = x+1
2nd Integer = 47+1
2nd integer = 48
47 and 48 are the integers.
Keywords: Addition
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3.50x + 266 = 406
↓
40x
The answer is 40. She needs to sell 40 more bracelets to reach her goal.
The equation of this parabola will have the form f(x) = a(x+5)(x-4), which works out to f(x) = a(x^2 + x - 20). Since the parabola passes thru (3,40),
40 = a(3^2 + 3 - 20), or 40 = a(-8), so a = -5.
Thus, the equation of this parabola is y = -5(x^2 + x - 20).