The ratio of red marbles to blue marbles in a jar is 2 to 5. If there are a total of 56 marbles in the jar, how many are red?
8 red
40 red
16 red
7 red

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64

in total they made   333.74 your welcome : d