A = -2 -1 B = C = D =
9 -3 1 -7 2 -1 3 0 5
1. C + D 2. A + B 3. AB 4. CD

5. 2DC 6. 3C – 4D 7. B2

8. 3BA

9. Solve for the matrix equation X. 10. Solve for the matrix equation Y.
2X + C = D 2(Y - D) = C

687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm