K+a=500 3k+10a=3600

K+a=500
K= 500-a

Using substitution, what would i do for this next part?

3K+10(500-a) = 3600

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.