Answer:The correct answer is n²+3
Step-by-step explanation:
We find the first differences between terms: 7-4=3; 12-7=5; 19-12=7; 28-19=9.
Area = 1/2 * base * height
the height is BDand the base is AC
so its area = 1/2 * BD * AC
5x+4y = 73
-4x + 4y = -8
5x + 4y -(-4x+4y) = 73 -(-8)
5x + 4y + 4x - 4y = 81
5x + 4x + 4y - 4y = 81
9x = 81
x = 81÷9
x = 9
Substitute x = 9 into any of the equations to find y.
5(9) + 4y = 73
45 + 4y = 73
4y = 73 - 45
4y = 28
y = 28÷4
y=7
Answers :
x = 9
y = 7