Answer:
graph c is the correct answer
y=(-4/5)x+4
Step-by-step explanation:
4x+5y=20
5y=-4x+20
324 inches
18 x 18 or 18² is 324
12 CM is the best answer.
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Hypotenuse² = perpendicular² + base²
H² = 20²+21²
H²= 400+441 = 841
H = √841
H = 29 cm