It is called a quadrilateral
Substituting -3 for x, we have: (-3)^2-3*-3-7. This simplifies to 9+9-7, or 11.
Answer:
Z - score = 2.83
Step-by-step explanation:
Given the following :
Number of samples (N) = 60
Sample mean (x) = 41.9mg
Population mean (μ) = 40mg
Population standard deviation (sd) = 5.2
Using the relation :
Z = (x - μ) / (sd / √N)
Z = (41.9 - 40) / (5.2 / √60)
Z = 1.9 / (5.2 / 7.7459666)
Z = 1.9 / 0.6713171
Z = 2.8302570
Therefore, the z-score = 2.83
Answer:
Combine like terms: 18x + 15x = 33x
(45 + 33x + 6x2)
Step-by-step explanation:
The number is 32
<em><u>Solution:</u></em>
The number is 10y + x (original)
Let the units place be x
Let the tens place be y
The sum of a particular two digit number is 5
Therefore,
x + y = 5 ----- eqn 1
If this numbers digits are reversed, then the number is decreased by 9
numbers digits are reversed = 10x + y ( digits are reversed )
Then, the number is decreased by 9
10y + x - 9 = 10x + y
10y + x - 10x - y = 9
-9x + 9y = 9
Divide by 9 entire equation
-x + y = 1 ------- eqn 2
Add eqn 1 and eqn 2
x + y - x + y = 5 + 1
2y = 6
y = 3
<em><u>Substitute y = 3 in eqn 2</u></em>
-x + 3 = 1
-x = 1 - 3
-x = -2
x = 2
Thus the original number is:
Number = 32