Answer:
22.5
Step-by-step explanation:
7 1/4 × 2
=29
29+81/2
=69.5
69.5 - 2
=67.5
67.5÷3
=22.5
x=31,y=−61
Put the equations in standard form and then use matrices to solve the system of equations.
5x+4y=1,3x−6y=2
Write the equations in matrix form.
(534−6)(xy)=(12)
Left multiply the equation by the inverse matrix of (534−6).
inverse((534−6))(534−6)(xy)=inverse((534−6))(12)
The product of a matrix and its inverse is the identity matrix.
(1001)(xy)=inverse((534−6))(12)
Multiply the matrices on the left hand side of the equal sign.
(xy)=inverse((534−6))(12)
For the 2×2 matrix (acbd), the inverse matrix is (ad−bcdad−bc−cad−bc−bad−bca), so the matrix equation can be rewritten as a matrix multiplication problem.
(xy)=(5(−6)−4×3−6−5(−6)−4×33−5(−6)−4×345(−6)−4×35)(12)
Do the arithmetic.
(xy)=(71141212−425)(12)
Multiply the matrices.
(xy)=(71+212×2141−425×2)
Do the arithmetic.
(xy)=(31−61)
Extract the matrix elements x and y.
x=31,y=−61
Step-by-step explanation:
<h3><u>QU</u><u>ESTION</u><u>:</u><u>-</u></h3>
<u>Fin</u>d 26th term of the A.P --15,-35,-55,-75...
<h3><u>Solu</u><u>tion</u><u>:</u><u>-</u></h3>
First term=a=-15
Common Difference=d=-20
We know that
well...
15 x 20 = 300
300+85 = 385
you can get 20 watches for $385
Answer: 0.07 centimeters
Step-by-step explanation: 0.7millimeters equals 0.07 centimeters
