Which should be calculated first to solve this problem?

West's mother gave him $40 to spend at the toy store to buy presents for his cousins. West already had $20 saved from doing errands. West bought 3 toy trucks for $9.99 each and a basketball for $8.99. West had to pay 9% tax on his purchases. How much did West spend?

A.
the cost of 3 basketballs

B.
the total cost of one toy trucks and one basketball

C.
the amount of tax paid

D.
the cost of 3 toy trucks

Given abcd ac=38 and ae=3x+4 find the value of x

Name and describe the three most important measures of central tendency. choose the correct answer below. a. the mean, sample size, and mode are the most important measures of central tendency. the mean of a data set is the sum of the observations divided by the middle value in its ordered list. the sample size of a data set is the number of observations. the mode of a data set is its highest value in its ordered list. b. the sample size, median, and mode are the most important measures of central tendency. the sample size of a data set is the difference between the highest value and lowest value in its ordered list. the median of a data set is its most frequently occurring value. the mode of a data set is sum of the observations divided by the number of observations. c. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is the product of the observations divided by the number of observations. the median of a data set is the lowest value in its ordered list. the mode of a data set is its least frequently occurring value. d. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is its arithmetic average. the median of a data set is the middle value in its ordered list. the mode of a data set is its most frequently occurring value.

What number is 7 units left of -15?