Mr. ripley's fruit stand sells watermelons for
$5 and apples for $2. last weekend, he sold
40 pieces of fruit (all apples and
watermelons) for $107. how many
watermelons did he sell?

What is the domain of the of the exponential function shown below?

Which graph represents the function f(x)=4[x]?

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.