The equation below can be used to find h, the number of hours it will take Abbott and Costello to prepare Thanksgiving dinner.
H/6 + H/18 = 1

How many hours will it take them to prepare dinner?

-1 1/2
-4 1/2
-6
-9
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Hailey, a chemistry student, is measured samples of a metallic substance for an experiemnt on density, using a balance that measures to 1/10 of a gram. Which is the most accurate measurement based on the limitations of the balance that might be found in her recorded data?
-9/01 grams
-9.2 grams
-9.24 grams.
-9.244 grams.
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Students were asked to write a formula for the length of a rectangle by using the formula for its perimeter, p = 2l + 2w. Three of their responses are shown below.
I. L= 1/2p - w
II. L=(p - 2w)
III. L= P-2w / 2

Which responses are correct?
- I and II
- II and III
- I and III
- I, II, and III
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The first two should be switched, the first question asked is #14 and the second one asked is #13, the last one is #18

I really need help with these questions, but if you have all the answers just so I can check my other answers that will be great <3
I will give brainliest to the person who gives all the right answers (either to the three I asked or all 19 questions, excluding #12 which I have on my own :3)

I know thats alot to ask for but I really, REALLY, need to pass this class so please help me!

To solve this question, you have to equalize the denominator of the equation. The greatest common multiple of 6 and 18 is 18, so you have to change the denominator to 18. The calculation would be:

H/6 + H/18 = 1

H/6 * 3/3 + H/18 = 1

3H/18 + H/18 = 1

4H/18 = 1

H= 18/4= 4.5

2. Answer: 9.2 grams

Halley measured samples of a metallic substance for an experiment on density with equipment that has lowest unit 1/10 gram or 0.1 gram. The equipment should not be able to differentiate unit lower than 0.1 gram, so it is not possible to have result such as 9.24 grams. or 9.244 grams.

3. To find the formula to find length of a rectangle from its perimeter you need to move the length(l) into the left of the equation. The calculation would be:

p = 2L + 2w

p-2w=2L

2L= p-2w

L=1/2p -w

The equation of I is right, but the equation of II and III is not.

I. L= 1/2p - w ----> right

II. L=(p - 2w) ---> wrong, should be 2L=(p - 2w)

III. L= P-2w / 2---> wrong, should be L= (P-2w)/ 2