Answer:
108 km/hr
Step-by-step explanation:
45 minutes = 3/4 hours
1) Distance = speed × time
= 60 × 3/4
= 45 km
2) 20 minutes = 1/3 hours. So, 3/4 - 1/3 = 5/12 hours.
speed = distance / time
= 45 / 5/12
= 108 km/hr
Answer: C, 9 units
Step-by-step explanation:
(-4, -3) is new point
ANSWER :
Surface area of larger cone : 24π units^2
Surface area of smaller cone : 6π units^2
The surface area of the smaller cone is 25% of that of the larger cone.
EXPLANATION :
From the given problem,
AB = 3 is the radius of the larger cone and the slanted height is BC = 5
DE = 1.5 is the radius of the smaller cone and the slanted height is EC = 2.5
Recall the surface area of the cone :
where r = radius and L = slanted height.
For the larger cone, r = 3 and L = 5
For the smaller cone, r = 1.5 and L = 2.5
Comparing the surface areas :
The area of the smaller cone compared to the larger cone is :
(34-4) + 65) X 45
(30 + 65 X 45
30 + 2925
2955
If these are the choices:
A. 8m – 38
B. 8m + 7
C. 8m + 31
<span>D. 2m – 38
Solution:
6(2m - 1) - 4(m + 8)
distributive property of multiplication:
6(2m) + 6(-1) -4(m) -4(8)
12m - 6 -4m -32
combine like terms:
12m - 4m - 6 - 32
8m - 38 choice A. </span>