Cho A
và
B
là các ma trận vuông cấp n thỏa
1 A PBP

, với
P
là ma trận vuông cấp n khả
nghịch. Phát biểu nào sau đây là sai
A. A khả nghịch khi và chỉ khi B khả nghịch B.
3 1 3 B P A P 

C.
3 1 3 3 3 B (P ) A P 

D. Giả sử A khả nghịch, ta có
1 1 det(A ) det(B )  
 .

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Someone answer this asap rn for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =

The measure of an angle is 117°. what is the measure of a supplementary angle?