Answer:
the student should score atleast 229 to be among the top 10%.
Step-by-step explanation:
in terms of the normal distribution, and if the table that you're using calculates the area of the normal distribution from the mean to a point x, only then what we are actually finding the value 'x' at which the z-score is at 40% (the rest 50% is already skipped by the table)

after finding the the value at this z-score, we can find the value of x at which the score is in the top 10% range.
we can find the z-score either using a normal distribution table or calculator. (but be sure what area is it calculating)
looking at the table the closest value we can find is, 0.4015 at z = 1.29 ((it is above 40% because we want to be in the top 10% range)




the student should score atleast 229 to be among the top 10%.
Answer:

Step-by-step explanation:
First, subtract 50.45x from both sides. Then divide by 7.5 on both sides.

Answer:
The radio would be 3:8 or 3/8
Step-by-step explanation:
One way to do it to divide 18 by 48. If you get a fraction of your calculator, convert it into a fraction. A fraction and a ratio are the man the same thing but are written in different ways.
Answer:

Step-by-step explanation:
The easiest way to solve this equation is to first find and highlight a common factor between two terms. In this case, x^2 can be factored to rewrite the equation as follows:

The (x+7) term can be crossed out on both sides and then for this equation to be true, there are two possibilities:
Either

or

Therefore, the solutions to this equation are -1, 1 or -7.