Answer:
First option: 6y^2sqrt(10) + 12sqrt(5y)
Step-by-step explanation:
3sqrt(10) * (2y^2 + 2sqrt(2y)
= 6y^2sqrt(10) + 6sqrt(20y)
= 6y^2sqrt(10) + 12sqrt(5y)
Answer:
1 2/4
Step-by-step explanation:
3/4 doubled is 
Now,
on simplification.

Therefore,
3/4 doubled is 1 2/4
Answer:
car a, car b
Step-by-step explanation:
car a 2x + 2= 4x
car b 3x + 3= 9x
both cars 13x
Answer:
≈ 26.39 inches
Step-by-step explanation:
The circumference of a circle is 2πr or πd with r meaning radius and d for diameter. Since we know the diameter already, we can substitute the value in for d:
C = π(8.4) = 8.4π ≈ 26.39