exam Maths Puzzle Numerical Ability

graph the following equation on the same set of axes

x+y=0

x+2y=0

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exam Other Question

Graph the function.

f(x)=x squared+3
if someone wanted an average grade of 90 and they base the grade on 4 tests and the first 3 scores were 84 93 and 88 what would the last test score grade have to be to get a total average of 90?
85
88
92
or
95