Let V = (8, -4) and W = (-4,2).
2 answers:
Answer:
Option B and C are correct.
Step-by-step explanation:
Given the vectors V = (8, -4) and W = (-4,2)
we have to check the following options.
Option A: V x W = 40
Hence, not true
Option B: The y-component of W is 2
W = (-4,2)
x-component is -4
y-component is 2
Hence, true
Option C: V = -2W
W=(-4, 2)
V=-2(-4,2)=(8,-4)
which is true
Option D: The x-component of V is 4
V = (8,-4)
x-component is 8
y-component is -4
which is not true.
hence, the option B and C are correct.
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2 solutions
remember
and
and
so
1=x²+4x-5
minus 1 both sides
0=x²+4x-6
use quadratic formula or complete the square
2 solutions
The expression that we need to get is:
So the correct option is the second one.
<h3>Which expression gives the number of gallons of stain Bradley will need?</h3>
We know that 1 gallon is enough to cover 200 ft².
We have two rectangular areas, one of:
23 feet by 10.4 feet, and other of 10.5 feet by 7.2 feet.
Then the total area is:
A = (23 ft)*(10.4 ft) + (10.5ft)*(7.2 ft)
The number of gallons needed is given by the quotient between the area that we want to cover, and the area that covers one gallon, so the expression is:
So the corerect option is the second one.
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