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2 years ago

Write in summation notation.

Mathematics

1 answer:

Ivahew [28]2 years ago

3 0

If that is -2+1+4+13 I think it should be 16

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Will Mark Brainlest helpppp

Anvisha [2.4K]

Answer:

R = $\left[\begin{array}{ccc}-3&-2\\1&-3\\\end{array}\right]$

Step-by-step explanation:

P - Q + R = I ( I is the identity matrix )

$\left[\begin{array}{ccc}2&4\\3&5\\\end{array}\right]$ - $\left[\begin{array}{ccc}-2&2\\4&1\\\end{array}\right]$ + R = $\left[\begin{array}{ccc}1&0\\0&1\\\end{array}\right]$ ( subtract corresponding elements )

$\left[\begin{array}{ccc}2-(-2)&4-2\\3-4&5-1\\\end{array}\right]$ + R = $\left[\begin{array}{ccc}1&0\\0&1\\\end{array}\right]$

$\left[\begin{array}{ccc}4&2\\-1&4\\\end{array}\right]$ + R = $\left[\begin{array}{ccc}1&0\\0&1\\\end{array}\right]$

R = $\left[\begin{array}{ccc}1&0\\0&1\\\end{array}\right]$ - $\left[\begin{array}{ccc}4&2\\-1&4\\\end{array}\right]$ = $\left[\begin{array}{ccc}-3&-2\\1&-3\\\end{array}\right]$

6 0

2 years ago

I need help with #7 c and d

Misha Larkins [42]

Answer:

c. 33.0%

d. 14.5%

Step-by-step explanation:

For answering questions about percentages in different categories or combinations of categories, it is convenient to find the totals of rows and columns in the table. These totals are shown in the attached.

Students who surf total 32+65 = 97. Of those, 32 also skateboard. The requested percentage is ...

32/97 × 100% ≈ 33.0% . . . . surfers who also skateboard

The total number of students is 166. Of those, the number who neither surf nor skateboard is 24. That percentage is ...

24/166 × 100% ≈ 14.5% . . . . students who don't surf or skateboard

_____

<em>Additional comment</em>

a. 97/166 ≈ 58.4% surf

b. 89/166 ≈ 53.6% do not skateboard

This sort of table is called a "two-way table." One set of categories is represented in rows, another set is represented in columns. This table is filled with <em>frequencies</em>. Such tables can also display <em>relative frequencies</em> by dividing the entire table by the total of totals in the lower right corner.

3 0

1 year ago

Rudy correctly solved the equation 10 = 4r.

VLD [36.1K]

Answer:

its B

Step-by-step explanation:

6 0

2 years ago

How do u express a ratio as a decimal

Viktor [21]

Perform the indicated division ... divide the numerator by the denominator.
The quotient is the decimal form of the ratio.

6 0

3 years ago

To make a specific hair dye, a hair stylist uses a ratio of 1 1/8 oz of red tone, 3/4 oz of gray tone, and 5/8 oz of brown tone

Ad libitum [116K]

Answer:

depending on what your using these are the answers to what I got:

Addition: 2 1/2

Multiplication: 135/256

Division: 2 2/5

Step-by-step explanation:

1 1/8 + 3/4 + 5/8 = 5 /2 = 2 1/2 = 2.5

1 1/8 x 3/4 x 5/8 = 135/256 = 0.527

1 1/8 ÷ 3/4 ÷ 5/8 = 12/5 = 2 2/5 = 2.4

7 0

1 year ago