Solve . - 3a + 8 = 14
1 answer:
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Answer:
Step-by-step explanation:
The equations of lines are :
y=4x-5 and y=ax+2
From above equations,
4x-5 = ax+2
4x-ax = 5+2
4x-7 = ax
So, the value of a is equal to .
Answer:
For a rectangle of length L and width W, the area is:
A = L*W
In this case, we know that;
The length is 18ft more than the width.
L = W + 18ft
The area is 175 ft^2
Then:
A = 175 ft^2
Then we have a system of two equations:
L = W + 18ft
A = L*W = 175 ft^2
To solve this, the first step would be to replace the first equation into the second one:
(18ft + W)*W = 175ft^2
Now we can solve this for W.
18ft*W + W^2 - 175ft^2 = 0.
This is the quadratic equation, i will solve it just to be complete.
We have a quadratic equation, using the Bhaskara formula we can find the two solutions as:
Then the two solutions are:
W = (-18ft - 32ft)/2 = -25ft (This option can be discarded, because a negative width has no sense)
W = (-18ft + 32ft)/2 = 7ft
Then the width is 7ft long, and the lenght will be:
L = W + 18ft = 7ft + 18ft = 25ft
Answer:
$2280
Step-by-step explanation:
Given: Cost of Air conditioner= $3000.
Rate of depreciation= 8%
Number of year= 3 years.
Now, finding the depreciation for 3 years.
Depreciation=
Amount of depreciation=
∴ Amount of depreciation in 3 years is $720.
Cost of Air conditioner after 3 years=
⇒ Cost of Air conditioner after 3 years=
∴ Cost of Air conditioner in 3 years is $2280.