Answer:66
Step-by-step explanation:
Let number of boys be x
total number of boys and girls = x+42
7/11 *(x+42) = 42
7x + 294 = 462
7x = 168
x = 24
Total number = 24+42=66
Answer:
y=-3x^2+12x+63
y=-3(x-7)(x+3)
y=-3(x^2-4x-21)
Answer: 63/2π
Step-by-step explanation: C=πd
63=πd
D=63/π
r=1/2d
1/2×63/π=<u>63/2π</u>
equation 2