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How to write 3 tenths and 5 tenths as a decimal

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is: