A cross-country runner runs 20 km in 40 minutes. What is his average speed? 5 m/s
.5 m/s
5 m/s/s
O .5 m/s/s

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

answer///scientific method;