How many different four-letter secret codes can be formed if the first letters must be an s or a t

answer: s

step-by-step explanation:

s and t just pick s

answer:

once you know the sum of the interior angles in a polygon it is easy to find the measure of one interior angle if the polygon is regular: all sides are congruent and all angles are congruent. just divide the sum of the angles by the number of sides.

step-by-step explanation:

the interior angle of a polygon is one of the angles on the inside.

hope this

answer:

short answer 2 * 2 * 2 = 8

step-by-step explanation:

the first digit can be either a 1 or a 7. you have 2 choices.

once you have decided you can write either a 1 or 7 for the second which is 2 choices

same with the third.

the numbers are

1 * 1 * 1

1 * 1 * 7

1 * 7 * 1

1 * 7 * 7

7 * 1   *1

7 * 1 * 7

7 * 7 *1

7 * 7 *7