1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Talja [164]
3 years ago
9

!!!!!!!HELP ASAP!!!!!!!!!

Mathematics
1 answer:
Scrat [10]3 years ago
4 0
7/28 = 4/?
4*28 = 112. (a) = 16
112 ÷ 7 = 16.

7/588 = 4/?
4*588 =2,352. (b) = 336
2,352 ÷ 7 = 336

7/686 = 4/?
4*686 = 2,744. (c) = 392
2,744 ÷ 7 = 392
You might be interested in
The percentage 21 is of 28 is equal to the percentage 30 is of 40<br> True?<br> or false?
katovenus [111]

Answer:

False

Step-by-step explanation:

75%

21

28 5.88

21 x 28

100

= 5.88

x 100% = 75%33.3333333333%

28 - 21

21

x 100% = 33.3333333333%

5 0
2 years ago
Find the exact value of the trigonometric expression given that sin u = − 8 17 and cos v = − 24 25 . (Both u and v are in Quadra
Rashid [163]

Answer: sin u = -5/13 and cos v = -15/17

Step-by-step explanation:

The nice thing about trig, a little information goes a long way. That’s because there is a lot of geometry and structure in the subject. If I have sin u = opp/hyp, then I know opp is the opposite side from u, and the hypotenuse is hyp, and the adjacent side must fit the Pythagorean equation opp^2 + adj^2 = hyp^2.

So for u: (-5)^2 + adj^2 = 13^2, so with what you gave us (Quad 3),

==> adj of u = -12 therefore cos u = -12/13

Same argument for v: adj = -15,

opp^2 + (-15)^2 = 17^2 ==> opp = -8 therefore sin v = -8/17

The cosine rule for cos (u + v) = (cos u)(cos v) - (sin u)(sin v) and now we substitute: cos (u + v) = (-12/13)(-15/17) - (-5/13)(-8/17)

I am too lazy to do the remaining arithmetic, but I think we have created a way to approach all of the similar problems.

3 0
2 years ago
skew-symmetric 3 x 3 matrices form as subspace of all 3 x 3 matrices and find a basis for this subspace.
Neporo4naja [7]

Answer:

a) ∝A ∈ W

so by subspace, W is subspace of 3 × 3 matrix

b) therefore Basis of W is

={ {\left[\begin{array}{ccc}0&1&0\\-1&0&0\\0&0&0\end{array}\right] ,\left[\begin{array}{ccc}0&0&1\\0&0&0\\-1&0&0\end{array}\right] ,\left[\begin{array}{ccc}0&0&0\\0&0&1\\0&-1&0\end{array}\right]}

Step-by-step explanation:

Given the data in the question;

W = { A| Air Skew symmetric matrix}

= {A | A = -A^T }

A ; O⁻ = -O⁻^T        O⁻ : Zero mstrix

O⁻ ∈ W

now let A, B ∈ W

A = -A^T       B = -B^T

(A+B)^T = A^T + B^T

= -A - B

- ( A + B )

⇒ A + B = -( A + B)^T

∴ A + B ∈ W.

∝ ∈ | R

(∝.A)^T = ∝A^T

= ∝( -A)

= -( ∝A)

(∝A) = -( ∝A)^T

∴ ∝A ∈ W

so by subspace, W is subspace of 3 × 3 matrix

A ∈ W

A = -AT

A = \left[\begin{array}{ccc}o&a&b\\-a&o&c\\-b&-c&0\end{array}\right]

= a\left[\begin{array}{ccc}0&1&0\\-1&0&0\\0&0&0\end{array}\right] +b\left[\begin{array}{ccc}0&0&1\\0&0&0\\-1&0&0\end{array}\right] +c\left[\begin{array}{ccc}0&0&0\\0&0&1\\0&-1&0\end{array}\right]

therefore Basis of W is

={ {\left[\begin{array}{ccc}0&1&0\\-1&0&0\\0&0&0\end{array}\right] ,\left[\begin{array}{ccc}0&0&1\\0&0&0\\-1&0&0\end{array}\right] ,\left[\begin{array}{ccc}0&0&0\\0&0&1\\0&-1&0\end{array}\right]}

8 0
3 years ago
HELP ITS TIMEDDD !!!!
lidiya [134]

Answer:

SAS.........,..,....

8 0
3 years ago
Which expression represents the
ki77a [65]

The expression that represents the number of reams of paper produced in the second year is 4.704 x 10^{10} (option d)

<h3>What is the expression that represents the reams produced in the second year. </h3>

The quantity of paper produced in the first year is written in scientific notation. Scientific notation is used to compress larger numbers into smaller numbers.  

In order to write a number in scientific notation, the number is written as a decimal number, between 1 and 10 and multiplied by a power of 10.

For example, The number 5 x 10³ is equivalent to 500

Paper produced in the second year = paper produced in the first year x 5.6

(8.4 x 10^{9} ) x 5.6 = 47.04 x 10^{9}

4.704 x 10^{9 + 1}

= 4.704 x 10^{10}

To learn more about scientific notation, please check: brainly.com/question/25334755

#SPJ1

5 0
2 years ago
Other questions:
  • Write the equation of a line that is perpendicular to the given line and that passes through the given point.
    5·1 answer
  • You deposit $7000 into a bank account that has 6% interest compounded SEMIANNUALLY. Determine the amount of money in the bank af
    11·1 answer
  • What’s the correct answer for this?
    6·2 answers
  • 2ND TIME POSTING THIS PLS HELP ME WITH 3, 4, AND 5 BRAINLIEST PLUS YOU WILL GET 100 POINTS
    7·2 answers
  • Does the point (0, 0) satisfy the equation y = 9x?
    15·1 answer
  • Natalie's team needs to make a decision on how to handle a big product recall. People on the team have a lot of strong opinions.
    11·1 answer
  • Helpppppppppppppppppppp
    11·1 answer
  • Tony gets paid $5 per hour to babysit his cousin. This
    6·1 answer
  • Can someone explain this step by step? I'm very confused on how to solve it. Thanks!
    5·2 answers
  • X
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!