Cards in a pack are black or red in the ratio black: red = 2:5
What fraction of the cards are red?
a) 7/10
b) 2/5
c) 5/7
d) 2/7

pls help

Karianne and lucius are analyzing a linear function on a graph. karianne says that unit rate is equal to rate of change, but that slope is calculated differently. lucius says that unit rate, rate of change, and slope are calculated the same way. who is correct? explain your answer.

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?