Answer:
Calculating (5 x 2) violates the order of operations
Step-by-step explanation:
According to the order of operations, multiplies all have equal priority. Therefore, they must be evaluated left to right, not right to left. Evaluating (5 x 2) first is incorrect, and instead (9 x 5) should be calculated first.
Answer:
The first answer is 3, and the second answer is groups of 3 allow 4 rows of 9 students.
Step-by-step explanation:
Not sure I guessed on the question and got it right, just trying to help people out.
Your proportion should look something like this

After cross multiplication, you should end up with this equation

After dividing 4 on both sides, you should get that x=9
Answer:
Step-by-step explanation:
Please use parentheses so that there's no question about what constitutes the argument of the sqrt function:
y=2 sqrt x+4 → y = 2√(x + 4)
This result is obtained from y = √x by:
1) translating the graph of y = √x 4 units to the LEFT, and
2) stretching the resulting graph vertically by a factor of 2.
Answer:
0.2384 = 23.84% probability that 3 were laser printers.
Step-by-step explanation:
The printers will be chosen without replacement, which means that the hypergeometric distribution is used to solve this question.
Hypergeometric distribution:
The probability of x sucesses is given by the following formula:

In which:
x is the number of sucesses.
N is the size of the population.
n is the size of the sample.
k is the total number of desired outcomes.
Combinations formula:
is the number of different combinations of x objects from a set of n elements, given by the following formula.

In this question:
20 orders means that 
8 were laser printers, which means that 
Sample of 5 means that 
What is the probability that 3 were laser printers?
This is P(X = 3).


0.2384 = 23.84% probability that 3 were laser printers.