Aand b are n×n matrices. check the true statements below: a. if deta is zero, then two rows or two columns are the same, or a row or a column is zero. b. detat=(−1)deta. c. the determinant of a is the product of the diagonal entries in a. d. if two row interchanges are made in sucession, then the determinant of the new matrix is equal to the determinant of the original matrix

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950