9514 1404 393
Answer:
A. 3/8 ft
B. width would decrease
Step-by-step explanation:
A. The area of a rectangle is given by the formula ...
A = LW
Solving for W, we find ...
W = A/L . . . . . width is inversely proportional to length for the same area
Using the given dimensions, we find the width to be ...
W = (3/10 ft²)/(4/5 ft) = (3/10)(5/4) ft
W = 3/8 ft
The width of the card is 3/8 ft.
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B. Width is inversely proportional to length for the same area, so an increase in length would result in a decrease of width.
12.15 km /h
Step-by-step explanation:
Step 1 :
Given
Distance between Airy Town to Brightvale = 9 km
Speed of Ricky = x km/h
Step 2:
Speed taken by Sam = x + y km/h
Time taken by Sam = 40 min = 40/60 hrs = 2/3 hrs
so we have (x+y) 2/3 = 9
Step 3:
Speed taken by Timothy = x - y km / h
Time taken by Timothy = 50 min = 50/60 = 5/6 hrs
= > (x-y) 5/6 = 9
Step 4 :
Solving the 2 equations
(x+y) 2/3 = 9 and (x-y) 5/6 = 9 we have
(2/3)x + 2/3(y) = 9 = > 2x + 2 y = 27
5/6(x) - 5/6(y) = 9 = > 5 x - 5 y = 54
Multiplying the first equation by 5 and the second by 2 we have ,
10 x + 10 y = 135 and 10 x - 10y = 108
Adding both,
20 x = 243 => x = 12.15.
This gives speed of Ricky as 12.15 km /h
Answer:
1) 366
2) 448
3) 748
Step-by-step explanation:
I say 6.3:1 or 10.1 because they ask for the brightest so between those to
Answer:
81 and above
Step-by-step explanation:
They have to be 81 and above
93+69+89+97=348
348/4=87 (average)
87=81=168
168/2= 84 (average)