A student group consists of 17 people, 7 of them are girls and 10 of them are boys. How many ways exist to choose a pair of the same-sex people?
a. 66
b. 136
c. 70
d. 202
a. 66
Mathematics
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If a triangle has vertices of 
and 
then the area of the triangle is given by 
Find the area of the triangle with vertices at the given points.(1, -3) (1, 1) (4, 3)
A. 6 B. 2.5 C. 12 D. 5
Mathematics
Find the midpoint of the segment with the given endpoints.(4, -8) and (-1, 2)
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Let 
represent the number of students present in a large class, where x represents the number of hours of study required weekly. What is the rate of change of the number of students in the class with respect to the number of hours of study?
A. 163 B. 13 C. -163 D. -13
Mathematics
Write the equation of the ellipse that has its center at the origin with focus at 
and major axis equal to 16.
?
A. 
B. 
C. 
D. 
E. none of these
Mathematics