exam Maths Puzzle Numerical Ability

HELP! Ana, Bob, and Chris will not disclose their weights but agree to be weighed in pairs Anna and Bob together weigh 226 pounds. Bob and Chris together weigh 210 pounds. Anna and Chris together weigh 200 pounds. How much does each student weigh?

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exam Other Question

g(x)=e^x+3
Description of transformation: Equation(s) from Horizontal Asymptote(s): y-intercept in (x,y) form:

I am not sure what this is asking me to do? Help
9x-5x^2=-2

2x^2-3x=x^2+18

15x^2+x=2

x^2-6x+9=-16