Choose the statements that are true about bonds. a. if atoms have a big electronegativity difference, they form an ionic bond. b. in ionic bonds, electrons are shared between atoms. c. in covalent bonding, electrons are shared between atoms. d. if atoms have a big electronegativity difference, they form a covalent bond.

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

In order for the bug to fly through the air a force has to push the bug forward. identify this force. how does the bug produce

Ways that industry and agriculture use physical properties to separate substances