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OpenStudy (babybritt002):
Twice Jack's age plus 5 is 21. Write and solve an equation. How old is Jack?
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OpenStudy (calculusxy):
Well set up an equation again: 2x + 5 = 21 Solve for x now.
OpenStudy (anonymous):
jack can be 8 because once you multiply that by 2 you get 16 and 16 plus 5 is 21 (:
OpenStudy (anonymous):
in that's exactly what you have in the equation lol , just saw that. @calculusxy
OpenStudy (calculusxy):
Yes. Look at the equation: 2x + 5 = 21 21 - 5 = 16 2x = 16 Divide both sides by 2 16/2=8 x = 8 Proof: 2(8)=16 + 5 = 21
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