Option A is correct.
Step-by-step explanation:
We need to identify which statement is true in matrix addition.
In matrix addition we just add the corresponding elements.
In the options given only Option A is correct i.e, (n+4)-7 = 18
All other options have error in them.
In Option B there should be -12 instead of +12
In Option C there should be -11 instead of 11
In Option D we are not adding corresponding entries.
So, Option A is correct.
Keywords: Matrix addition
Learn More about Matrix Addition at:
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Answer:
The factors of x^2+3x-4 are (x-1)(x+4) ....
Step-by-step explanation:
We have to find the factors of x^2+3x-4
As we know that this is a quadratic equation.
So we have to find the roots first.
The roots are -1 and 4.
Now completing the quadratic formula using the roots we have :
x^2+4x-x-4
Make a pair of first two terms and last two terms:
(x^2+4x)-(x+4)
Now take out the common from each pair:
x(x+4)-1(x+4)
(x-1)(x+4)
Thus the factors of x^2+3x-4 are (x-1)(x+4) ....
which means either
or
. The equation has no solution, since
is always bounded between -1 and 1. The second has one solution at
, and any number of complete revolutions will also satisfy this equation, so in general the solution would be
where
is any integer.
So you could choose
and
.
Answer: 7.012 x 10−8 ==> Option 3
Step-by-step explanation:
(3.012 x 10−8) + (4 x 10−8)=
(3.012+4) x 10−8=
(3.012+4.000) x 10−8=7.012 x 10−8 ==> Option 3
Answer: 67.5 mph
Step-by-step explanation:
The formula for speed is:
= Distance / Time
Distance = 658.125 miles
Time will need to be converted to a decimal. You may convert only the minutes into hours as the hours are already hours.
= 45/60 minutes
= 0.75 hrs
= 9 + 0.75
= 9.75 hours
Speed = 658.125 / 9.75
= 67.5 mph
