Answer:
5 km/h
Step-by-step explanation:
Let x km/h be Ed's rate in the evening, then x+1 km/h is his rate in the morning. It takes him
hours in the morning to pass 12 km;
hours in the evening to pass 12 km.
In total, it takes him 5 hours 24 minutes (
hours), then
Solve this equation:
Ed's rate cannot be negative, thus x=4 km/h. His morning rate is x+1=5 km/h.
Answer:
Height of the 12 cases will be = 
inches.
Step-by-step explanation:
Thickness of each DVD storage case = 
inches
Let number of DVD storage cases sold = x
Therefore, the height of cases sold will be represented by the expression 
If the number of cases sold x = 12
So the height of the cases sold will be = 
inches
= inches
Therefore, the answer is inches.
Mass=5.6
Find this by plugging your values into the density formula and solving for M.
Answer:
The fan = x = 400
The heater = y = 3600
Step-by-step explanation:
Let the cost price of
The fan = x
The heater = y
Aaya bought a fan and a heater for Rs 4,000.
x + y = 4000
x = 4000 - y
He sold the fan at a profit of 25%
25% × x = 0.25x
And the heater at a loss of 5%.
5% × x = 0.05y
If he gained 7% on his total outlay, at
Hence:
0.25x + 0.05y = 7% × 4,000
0.25x + 0.05y = 280
Note:
x = 4000 - y
Hence:
0.25(4000 - y) + 0.05y = 280
1000 - 0.25y + 0.05y = 280
Collect like terms
-0.25y + 0.05y = 280 - 1000
-0.20y = -720
y = -720/0.20
y = 3600
x = 4000 - y
x = 4000 - 3600
x = 400
Hence, the price that he bought each item is given as:
The fan = x = 400
The heater = y = 3600
<span>4(2x - 5) = 4
8x - 20 = 4
8x = 4 + 20
8x = 24
x = </span>
x = 3
Part A:This equation has only one solution. {Working shown above}
Part B:The solution is x = 3. {Working shown above}
