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3 years ago

Help with these questions

Mathematics

1 answer:

balandron [24]3 years ago

6 0

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]]

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.

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gulaghasi [49]

Answer 1:

For problem 1, each shirt can cost $15. Since their are two shirts, the price would equal up to $30. The remaining money can be the price of the athletic shoes, which is $65.

Equation: 15+15+65=95

Answer 2:

For problem 2, the pair of dress slacks can cost $55, the dress shoes can cost $100, and the and the blazer can cost $145.

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3 years ago

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Alenkasestr [34]

Answer:

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VERTEX (-2,-64)

Step-by-step explanation:

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3 years ago

Read 2 more answers

a population of bacteria grows at a rate of 45% the initial population contains an initial population of 350 what will populatio

monitta

You would use the A=Pe^rt equation here. A (total amount)= P (initial amount) e^r(rate)x t(time). Here is the equation for you to plug into your calculator. A=350e^0.45x10. The answer is..31505.99596

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Justin did push-ups for the past 555 days.The following data points are the number of push-ups he did each day.

Vitek1552 [10]

Answer: σ: 2.76

Step-by-step explanation:

Count, N: 5

Sum, Σx: 125

Mean, μ: 25

Variance, σ2: 7.6

Steps

look at attached pic for formula