9514 1404 393
Answer:
16) No
17) (c)
Step-by-step explanation:
For a lot of multiple-choice matrix problems, a simple test is all that is needed to determine the correct answer.
16) The determinant of A is (-2)(-2) -(2)(-3) = 10. So, we expect to see values in the inverse matrix that are 0.2 and 0.3. Alas, they're not there. The matrices are not inverses.
A^-1 = [[-.2, .3][-.2, -.2]]
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17) The matrices are both 3×3, so their product is possible (eliminates choice D). The upper left term is different among the answer choices, so we can determine the correct one by computing that term only.
BA=C
c11 = (5)(1) +(7)(5) +(3)(-1) = 5 +35 -3 = 37
This matches the third choice (C).
If you use a calculator to compute the full matrix product, it matches choice C in all details.
Answer:
5/4
Step-by-step explanation:
hope this helps ;)
The cost of the 7.5lbs of walnuts would be $2.16
P+ p(.08)= 51.84
p is the original price of the item
if you take 51.84 which is the total amount after taxes are added and divide it
by 1+tax you will get the original price
so if p + p(.08)=51.84 then 51.84/1.08= p
p =48
48+ 48(.08)=51.84
