The Statistical Abstract of the United States (109th edition) reported that the average cost per day of owning an automobile in the United States is $7.62 with standard deviation of $1.77. This includes the cost of the car, general maintenance, gasoline, and insurance. A random sample of 54 students who own cars found the average cost per day to be $6.78. Is the college student's average daily expense less than the national average

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,