What is the effect on the graph of the function f(x) = x2 when f(x) is changed to 7f(x)? A) stretched vertically B) compressed vertically stretched horizontally D) compressed horizontally​

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?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?