There are 48 students in a certain class, 25% of this are girls, How many boys are in the class?
1 answer:
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Answer:
Option 4: <u>(2x + 16)° + (x)° = 180°</u>
Step-by-step explanation:
See the attached figure.
For a quadrilateral inscribed in a circle
The opposite angles are supplementary.
So, ∠D + ∠B = 180°
From the figure:
∠B = x° and ∠D = (2x+16)°
∴ <u>(2x + 16)° + (x)° = 180°</u>
Answer:
Option 3
Step-by-step explanation:
We need to find a pair which shows equivalent expressions.
First equation is
Option 1 is incorrect.
Second equation is
Option 2 is incorrect.
Third equation is
Option 3 is correct.
Fourth equation is
Option 4 is incorrect.
Therefore, the correct option is 3.
Answer:
The z-score of 90 is 1.35
Step-by-step explanation:
The z-score is calculated using the formula:
From the question, it was given that the mean is
and the standard deviation is
and x=90.
We substitute the given values to obtain: