Why is this sentence in the plural?

Why is this sentence in the plural?

The plural of weather and normality
A little tug (flower, poem, literal, portable, decorative) can also be used to use skies
Oxford:You usually say the sky.When sky is used with an adjective,use a… sky.You can also use the plural form skies,especially when you are thinking about the great extent of the sky
The adjective is added between the article and sky
It can be used in the plural, especially in the vast sky

A class of 46 people went to the park for a spring outing. When they rented a boat, they learned that there were 5 people in each big boat and 3 people in each small boat. They needed 12 boats in total. Do you know how many big boats you can rent,
How many boats are there

If they are all small boats, they can only take 36 people, and there are still 10 people who have no place. Since the big boat takes 2 more people than the small boat, it needs 10 / 2 = 5 big boats, so there are 7 small boats and 5 big boats
Equation method
X large vessels
5x+3*(12-x)=46
5x+36-3x=46
2x=10
x=5

lim(2x+3/2x+1)^(x+1)

LIM (x tends to + ∞) [[(2x + 3) / (2x + 1)] ^ (x + 1)]
=LIM (x tends to + ∞) [[(2x + 1 + 2) / (2x + 1)] ^ (x + 1)]
=LIM (x tends to + ∞) [[1 + 2 / (2x + 1)] ^ (x + 1)]
=LIM (x tends to + ∞) [[1 + 1 / (x + 1 / 2)] ^ (x + 1 / 2) * [1 + 1 / (x + 1 / 2)] ^ (1 / 2)]
=LIM (x + 1 / 2 tends to + ∞) [[1 + 1 / (x + 1 / 2)] ^ (x + 1 / 2)] * LIM (x + 1 / 2 tends to + ∞) [[1 + 1 / (x + 1 / 2)] ^ (1 / 2)]
= e*1
= e
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If the function f (x) = (A-2) x2 + (A-1) x + 3 is even, then the monotone decreasing interval of function f (x) is______ ．

∵ the function f (x) = (A-2) x2 + (A-1) x + 3 is even, and the monotone decreasing interval of ∵ f (- x) = f (x) ∵ (A-2) X2 - (A-1) x + 3 = (A-2) x2 + (A-1) x + 3 ∵ (A-1) = A-1 is [0, + ∞), so the answer is: [0, + ∞)

15 yuan for a dress?
How to use a hat

a piece of clothes costs fifteen yuan
A cap or a hat

How many meters is four feet nine

Four feet nine equals 1.63 meters

Which number is the square of 9 plus the square of 15?
Detailed steps, urgent

9^2+15^2=81+225=306=（√306）^2

If I were a boy

If I were a boy

Is the sentence "the square difference of two consecutive odd numbers must be a multiple of 8"? Give reasons

The reason is that: (2n + 1) 2 - (2n-1) 2 = [(2n + 1) + (2n-1)] [(2n + 1) - (2n-1)] = (2n + 1 + 2n-1) (2n + 1-2n + 1) = 4N × 2 = 8N, 8N △ 8 = n

The derivative of function f (x) is f (x). Is it very special and difficult to find an example of F (x) discontinuity
The derivative of function f (x) is f (x). Is f (x) continuous in general?
If f (x) = | x |, its derivative function f (x) is discontinuous at x = 0, and f (x) = | x |, it seems that it is not differentiable?

F(x)=x^2*sin(1/x),F(0)=0
F (x) = f '(x) is defined on R, but it is discontinuous at 0
(Note: F (0) should be determined by definition)