Answer:
24
Step-by-step explanation:
15 =4
15x 6=90
4x6=24
USING PYTHAGORAS THEORAM,
x²+3²= 5²
x²+9= 25
x²= 25-9 = 16
x= √16
x= 4
OPTION D
1.(x+y)²
2. (x-4)²
3. (4a²-3b²)²
1.679 kg * (40 min)/(kg) + 20 min = 67.16 min + 20 min = 87.16 min