The equation below can be used to find h, the number of hours it will take abbott and costello to prepare dinner. h/6 + h/18 = 1 how many hours will it take them to prepare dinner? -1 1/2 -4 1/2 -6 -9 == 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. == 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 == 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 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 me!

1. 4.5 hour

The equation for time needed to prepare the diner is H/6 + H/18 = 1

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. 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

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !

c. heat from the poles back down towards the equator.