If the domain of the square root function f(x) is x less-than-or-equal-to 7, which statement must be true?

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.