Suppose you are given a relation r(a, b,c, d). for each of the following sets of fds, assuming they are the only dependencies that hold for r, do the following: (a) identify the candidate key(s) for r. (b) state whether or not the proposed decomposition of r into smaller relations is a good decomposition and briefly explain why or why not.

Consider this equation. |y + 6| = 2 what can be concluded of the equation? check all that apply. there will be one solution. there will be two solutions. the solution to –(y + 6) = 2 will be also be a solution to the given absolute value equation. the solution(s) will be the number(s) on the number line 2 units away from –6. the value of y must be positive since the variable is inside absolute value signs.

:malik received a $300 gift card from his grandparents and is using it only to pay for his karate lessons, which cost $30 per month. determine what amount, in dollars, remains on the card after 8 months.

Me because i don't understand how to do it.: )