Answer:
9/2
Step-by-step explanation:
perpendicular lines have slopes that are opposite and reciprocal
the reciprocal of -2/9 is 9/2
Use: (a + b)(c + d) = ac + ad + bc + bd

Answer:
d. x² + 6x +8
Answer: 81
Step-by-step explanation:
Mean of four nos = 85
Score = 85 x 4 = 340
Deduct 97 from 340 = 243
Mean of three nos. 243/3 = 81
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