Homework to be handed in tomorrow Hurry! The question is in the supplement

1) The cost of option 1 is 8x, and the cost of option 2 is 4x+120

2) 8x=4x+120 gives x=30 When the required instruments are 30 pieces, the cost of both schemes is the same.

3) When less than 30 instruments are required, the cost of option one is relatively small.

Solution: (1).

Option 1: Required fee = 8x

Option 2: Cost required = 120 + 4x

Solution: (2).

8x = 120 + 4x

4x = 120

x = 30

A: When 30 instruments are required, both options cost the same.

Solution: (3) 1If the cost of option 1 is less than the cost of option 2, then.

8x - 120 - 4x < 0

4x < 120

x < 30

Therefore, when less than 30 instruments are required, option 1 costs less.

2.If the cost of option 2 is less than the cost of option 1, then.

120 + 4x - 8x < 0

4x < 120

x > 30

Therefore, when more than 30 instruments are required, option 2 is less expensive.

To sum up: when the number of instruments required.

Less than 30 pieces: Option 1 costs less.

Equal to 30 pieces: From solution (2) it is known that the cost of both schemes is the same.

More than 30 pieces: Option 2 is less costly.

1) One: 8x

Two: 4x+120

2):8x=4x+120 x=30

3) 30 "Time Plan II.

30 hours option one.

So it only takes 24 days to complete.

A: Up to 6 days in advance.

Based on those 6s and 9s, you can push out the second row with a 7 on the far right, and the empty one on the right side of the third row 6 is a 3.

According to the 7 just launched and the 1 in the third row, the top row of 0 is 2 on the left, and the 6 on the left of the third row is 4.

Then if you are in the second row, the first number corresponds to the 9 in the first row. Then the three numbers in the fourth row should correspond to the first three numbers of 1463 in the third row, that is, 146.

Then 3 can be moved directly to the last row, and then according to the 5 on the right of the last row and the 6 in the third row, we can subtract to know that the third number in the fourth row is 9, and the second number in the fourth row can be 0, and then we can know that the first number in the second row is 1. Then the first number in the fourth row is 2. The first number in the fifth row is 3. In short:*

The two cars were released from the two states of A and B at the same time, and asked how long they met.

40 (45+35) = hours).

Answer: Hours meet after holding the pin.

1、would you?

you'd= you would, then the first half of the sentence is negative, and the second half of the sentence is would you

2、it's better

might mean "maybe", the difference between it might be better for and it is better for, just in tone, probably best... might), it is better...

you'd better to do sth.

It can be converted to it is better for you to do sth

It might mean that the person who is talking thinks you might be better off doing this, but he is not 100% sure!

Let's make use of English... Just like you say Chinese, you are not very sure about something, you will use "maybe".

Maybe it's better, and you'll use "best" or "should" for something you think you're sure of

Just show your opinion on the matter.

What's yo, you'D Better is an abbreviation for You Had Better.

Had better is a fixed match.

I don't have a solution, is the title copied by mistake?