3 years ago

Helppp me out this is my last question

Mathematics

1 answer:

prohojiy [21]3 years ago

4 0

Answer:

option 3

Step-by-step explanation:

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Given the vectors, a=3i+4j, b=-2i+5j, c=10i-j, d=-1/3i+5/2j, find -0.4a-0.3b+0.2d=?

sveta [45]

Answer:

$-\frac{2}{3}i - \frac{13}{5}j$

Step-by-step explanation:

-0.4(3i + 4i) - 0.3(-2i + 5j) + 0.2(- $\frac{1}{3}i$ + $\frac{5}{2}$ j)

-1.2i - 1.6j + 0.6i - 1.5j - $\frac{0.2}{3}$ i + 0.5j

Converting to fraction form;

$-\frac{6}{5}i + \frac{3}{5}i - \frac{1}{15}i - \frac{8}{5}j - \frac{3}{2}j + \frac{1}{2} j$

Solving the i part;

$\frac{-18i + 9i - i}{15}$ = $-\frac{2}{3}i$

Solving the j part;

$\frac{-16j-15j+5j}{10} = -\frac{13}{5}$ j

So -0.4a - o.3b + 0.2d = $-\frac{2}{3}i$ - $\frac{13}{5}j$

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3 years ago

Write the following comparison as a ratio reduced to lowest terms.

olasank [31]

Answer:

2.5 : 2

Step-by-step explanation:

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3 years ago

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The universal set in this diagram is the set of integers from 1 to 15. Place the integers in the correct place in the venn diagr

alexira [117]

Answer:

The universal set in this diagram is the set of integers from 1 to 15. Place the integers in the correct place in the venn diagram

Step-by-step explanation:

this is the answer

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2 years ago

The numbers of pages in the books in a library follow a normal distribution. If the mean number of pages is 180 and the standard

schepotkina [342]

For the answer to the question above, the numbers of pages in the books in a library follow a normal distribution. If the mean number of pages is 180 and the standard deviation is 30 pages, you can conclude that about 16% of the books have fewer than 150 pages. I hope this helps

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3 years ago

Translate this phrase into an algebraic expression. 63 decreased by twice Carlos's height Use the variable c to represent Carlos

nikitadnepr [17]

Answer:

63-2c

Step-by-step explanation:

You write 63 and substitute decreased with a subtraction sign. Twice means to multiple by 2. so for twice of Carlo's height you would write 2c.

I hope this helps!!!!!

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3 years ago