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To how many significant figures should each answer be rounded?
(6.626 x 10-34 J·s) (2.9979 x 108 m/s)
equation A:
= 4.524848610478 x 10-19 J(unrounded)
4.390 x 10-7 m
After rounding, the answer to equation A should have
O 5 significant figures.
O 1 significant figure.
3 significant figures.
O 4 significant figures.
O2 significant figures.

the answer is 75.0%.

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.