Write an equation for the following story: sarah bought 4 puzzles for christmas presents for her friends. she also bought a book for her mom that cost $7. she spent a total of $23. how much did each puzzle cost?

1) Be the number of  puzzles 4x , the cost of a book waas  $7, for a total cost of $23. if  x is the cost of puzzles

then  4x+ 7 = 23⇒4x = 23-7⇒4x= 16⇒x= 16/4 = 4, it means that every puzzles cost $4

correct answer:

a + bi

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.