Apizza delivery shop averages 30 minutes per delivery with a standard deviation of 4 minutes. what is the probability that a pizza takes less than 27 minutes to be delivered

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line