Câu 1. Tìm tập xác định của mỗi hàm số sau: a) = √−1 −2
b) y = √ + 5 − √4 − 2
Câu 2. Xét tính chẵn, lẻ của mỗi hàm số sau:
a) = 23 −
b) = |2 − 1| + |2 + 1| 10) = √1 − − √1 +

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)

6 and 24

step-by-step explanation:

6 x 4 = 24