21. An unknown substance from planet X has a
density of 10 g/mL. It occupies a volume of 80
mL. What is the mass of this unknown
substance?
a. 8 g
b. .125 g
c. 80 g
d. 800 g

800g

Step-by-step explanation:

I think in this question you should use the formula= mass =density x volume

=10g/ml x 80ml

=800 g

a. 32 degrees

step-by-step explanation:

here we have to use the rule.

m∠e = 1/2 (major arc - minor arc)

m∠e = 1/2 (212 - 148)

m∠e = 1/2 (64)

m∠e = 32 degrees

answer: a. 32 degrees

you

b

step-by-step explanation: