exam Maths Puzzle Numerical Ability

Please help me solve this.

Find the center and radius of the circle given by x^2+(y+4)^2=25.

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exam Other Question

For the 20 test scores shown, find the percentile rank for a score of 86.
75
63
92
74
86
50
77
82
98
65
71
89
75
66
87
59
70
83
91
73
Help! what is another solution to 144 besides 12 squared