Check all the statements that are true: A. If is a reflexive relation on a set S, then any two - related elements of S must also be related.
B. The less than or equal relation on the real numbers fails to be an equivalence relation because it is reflexive and transitive but not symmetric.
C. The equality relation on the real numbers is an equivalence relation.
D. If is an equivalence relation, then .
E. There are relations from a set with n elements to itself.
F. If a relation is symmetric, it cannot be anti-symmetric.
G. A function is a special relation.
H. If a relation is anti-symmetric, it cannot be symmetric.
I. A relation from a set with n elements to itself can have up to elements.
J. The equality relation on the real numbers is anti-symmetric.

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation:

b) k’(6, 4); l’(3, 3)

step-by-step explanation:

a 270° clockwise rotation maps every point (x, y) to (y, -x). (it negates the x-coordinate and then switches it and the y-coordinate.)

this means the endpoints of the side congruent to kl, k' and l', would be mapped as:

k'(-4, 6)→(6, 4)

l'(-3, 3)→(3, 3)

step-by-step explanation:

2 liters for 10   people

step-by-step explanation: