pre algebra help easy 10 points?

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Easy 10 points :)

1.) What are the domain and range of the relation {(4, 2), (0, 1), (0, 5), (8, 10)}?

aDomain: {2, 1, 5, 10}; Range: {4, 0, 8}

b Domain: {4, 0, 5, 10}; Range: {2, 1, 8}

c Domain: {4, 0, 8}; Range: {2, 1, 5, 10}

d Domain: {4, 2, 0, 1, 5, 8, 10}; Range: {4, 2, 0, 1, 5, 8, 10}

2.)Which relation is a function?
a {(5, 1), (4, 9), (6, 10)}

b {(0, 3), (0, 9), (12, 4)}

c {(5, 5), (5, 9), (5, 15)}

d {2, 10), (6, 10), (2, 3)}


Which relation is a function?

a{(1, 2), (1, 5), (1, 1), (1, 4)}

b{(8, 1), (2, 1), (3, 8), (2, 5}

c {(3, 4), (2, 5), (0, 9), (0, 12)}

d {(7, 12), (1, 5), (3, 10), (2, 5)}
 
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