exam Maths Puzzle Numerical Ability

For what values of k will the equation kx^2+(k-2)x+4k=0 have no real soloutions?

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exam Other Question

Anna has 12 bills in her wallet, some $5 an some $10. The total value of the bills is $100.How many of each bill does Anna have? Hello-

I am doing a review on algebra 1 and I am in need of some help.
This is the problem that I need help on:

"Write the equation of line AC, passing through A(1,4) and C (3,6)."
Thank you if you can help!