Answer:
The equation 5x + y = 0 represents a direct variation
The constant of variation is k=-5
Step-by-step explanation:
We need to tell if the equation 5x+y=0 represents a direction variation or not.
The equation for direct variation is:
where k is constant of variation.
In the given equation:
Comparing it with general equation for direct variation we get
so equation represents direct variation.
Value of k is -5
So, the constant of variation is k=-5
Answer:
D
Step-by-step explanation:
the median is the middle value of a data set in ascending order
If there is not an exact middle then it is the average of the values on either side of the middle
Arrange data in ascending order
15, 17, 19, 21, 23, 25, 26, 28, 28, 30
the middle is between 23 and 25 , hence
median = =
= 24
Answer:
Step-by-step explanation:
we are given some scenerios and we are to find out the total number of ways after mentioning permutations, combinations, or neither
a. How many ways can a coach choose two co-captains from 16 players in the basketball team?
Combination because both are having same position so order does not matter
16C2 = 120
b. In how many ways can seven questions out of ten be chosen on an examination?
Combinations because order of question does not matter.
10C7 = 10C3 = 120
c. Find the number of ways that 10 women in the finals of the skateboard street competition can finish first, second, and third in the X Games final.
Here order matters. Hence permutation
10P3 = 720
d. A postal zip code contains five digits. How many different zip codes can be made with the digits 0–9? Assume a digit can be repeated.
Here repitition is allowed. So neither permutation nor combination.
No of ways =