The answer must be

since the triangular pyramid has 4 faces and each has an area of 30

we should multiply that by 4 , so :
Answer:
9mph
Step-by-step explanation:
Speed = distance/time
Given
Distance = 9 miles and
Time = 1 hr
Speed = 9/1
= 9mph
1 hr = 60 mins
10 hr = ... mins
600 mins + 39 mins = ... mins
639 mins + 24 sec=......mins
91 cm × 24 = ...
IDK what convention factors are tho...
-41/25 I believe, I'm not sure why you put some addition signs in the inside of parentheses
X/29 = 2/5.8
(X) x (5.8). (2) x (29)
5.8x = 58
58/5.8
X = 10