10.The examination result of 60 students in Maths, Thai, and English was as follows ; 1 student failed in every subject. 20 students passed in Maths but failed in English.
14 students passed in Thai but failed in Maths. 16 students passed in English but failed in Thai.
18 students failed in Maths.
Find; 10.1 How many students passed in every subject?
10.2 How many students passed only in English?
10.3 How many students passed in English or Thai but not Maths?

Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?