Simple expressions use the arithmetic operators + and *, with both numbers and variables allowed as operands. the recursive definition of such expressions is as follows:

1) Any number or letter (i. e., a variable) is an expression.

2) if E and F are expressions, then so are E+F, E*F, and (E)

For example, both 2 and x are expressions by the basis. The inductive step tells us x+2, (x+2), and 2*(x+2) are all expressions. Notice how each of these expressions depends on the previous ones being expressions. Prove that every expression has an equal number of left and right parentheses.

529 and 531

step-by-step explanation:

all group life insurance is term insurance. actually it is annual renewable term and it is rated on the average age and claims experience of the entire group, which is called "experience rating." remember, this type of insurance has a 31-day grace period and is convertible to whole life upon leaving employment. a contributory group plan requires that both the employer and the employees pay part of the premium. at least 75% of those eligible must participate, so the group is sure to get most of the healthy employees as well as those that are sick.

step-by-step explanation:

after 1 year: 221 deer

step-by-step explanation:

30% of 170 is 51. 170+51=221