Answer:

Step-by-step explanation:
From the question we are told that:
Number of boys
Number of girls 
Total Number of students


Generally the equation for Probability of Choosing a Girl is mathematically given by



Answer:
c. 25°
Step-by-step explanation:
Sum of angles in a triangle:
The sum of the measures of the angles of a triangle is 180º.
In this question:
Angles of 3x, 2x-13 and 5x + 3.
The sum is 180º. So





Measure of each angle:
3x = 3(19) = 57º
2x - 13 = 2(19) - 13 = 38 - 13 = 25º
5x + 13 = 5(19) + 3 = 95 + 3 = 98º
The smallest angle is 25º, and the correct answer is given by option c.
Answer:
12 boys
Step-by-step explanation:
Multiply the ratio numbers by 6 and you have
boys : girls = 2 : 3 = 12 : 18
There are 12 boys in the class.
Answer:
70 degrees
Step-by-step explanation:
Supplementary means the angles add up to 180 degrees. We can set up an equation using this:
9x+20+6x+10=180
Combine like terms.
15x+30=180
Isolate variable.
15x=150
x=10
Substitute in the variable for the expression of angle B
6(10)+10=70
Hope this helps!
Answer:
Step-by-step explanation:
Since x = -15 is a vertical line, their is no y- intercept and the slope is undefined