是where is a set of keys 还是where are 回答是It‘s 还是They're是Is this a set of keys 还是 Are they a set of keys

是where is a set of keys 还是where are 回答是It‘s 还是They're是Is this a set of keys 还是 Are they a set of keys 是there is a set of keys还是there are a set of keys?is or are 英语翻译Part1 :Graphs of the from y=x²+k where k is a constant Whatto do:1Using a graphing package or graphics calculator:1 graph the two functions on the same set ofaxes2 state the coordinates of the vertex of eachfunctionA y=x²and y=x where the story is set? Here（）his set of keys,but where（）my keys?A、is；is B、is；areC、aee；are D、Her；her选谁? A set of keys is here划线提问A set of keys划线提问 这题看不懂,P is the set of positive factors of 20 and Q is the set of positive factors of 12.If x is a member of set P and y is the member of set Q,what is the greatest possible vaule of x-y?答案是19. I lost a set of keys.然后是用 Is this yours?还是Are these yours? 英语翻译Stop right where you are and set aside a couple of brain cells for the following statement:there is no such thing as private email Which of the following sets are closed under scalar multiplication?(i) The set of all vectors in R2 of the form (a, b) where a + 4b = 4.(ii) The set of all 2 × 2 matrices whose trace is equal to 1.(iii) The set of all polynomials i 英语翻译How many functions are there from the set {1,2,3,...,n},where n is a positive integer,to the set {0,1}a) that are one-to-one?b) that assign 0 to both 1 and c) that assign 1 to exactly one of the positive integers less than 主要是b和c here is a set of keys.改为否定句 A set of keys is in it.变为一般疑问句 A set of (钥匙)is on the desk . a set of a set of 英语翻译The total daily cost c,in dollars,of producing x units of a certain product is given by the function c(x)=k/5,where k is a constant (4x+1200)/x.If 20 units were produced yesterday for a total cost of $640,what is the value of 答案是50, They are a set of keys ,It's a set of keys 哪个是正确的?