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
Stels [109]
3 years ago
12

10x4ones= ones= 10x2tens= tens=

Mathematics
1 answer:
Vsevolod [243]3 years ago
5 0
Well, 10x4=40 because 10+10+10+10=40 and that means your answer must be 40 ones or you asked something else.
You might be interested in
James defines a circle as "the set of all the points equidistant from a given point." His statement is not precise enough becaus
Setler [38]
Okay so James needs to define a circle
8 0
3 years ago
Read 2 more answers
Please make this quick
AveGali [126]

Answer:

27

Step-by-step explanation:

3x3+2x9=27

8 0
3 years ago
Change each of the following points from rectangular coordinates to spherical coordinates and to cylindrical coordinates.
FromTheMoon [43]

Answer and Step-by-step explanation: Spherical coordinate describes a location of a point in space: one distance (ρ) and two angles (Ф,θ).To transform cartesian coordinates into spherical coordinates:

\rho = \sqrt{x^{2}+y^{2}+z^{2}}

\phi = cos^{-1}\frac{z}{\rho}

For angle θ:

  • If x > 0 and y > 0: \theta = tan^{-1}\frac{y}{x};
  • If x < 0: \theta = \pi + tan^{-1}\frac{y}{x};
  • If x > 0 and y < 0: \theta = 2\pi + tan^{-1}\frac{y}{x};

Calculating:

a) (4,2,-4)

\rho = \sqrt{4^{2}+2^{2}+(-4)^{2}} = 6

\phi = cos^{-1}(\frac{-4}{6})

\phi = cos^{-1}(\frac{-2}{3})

For θ, choose 1st option:

\theta = tan^{-1}(\frac{2}{4})

\theta = tan^{-1}(\frac{1}{2})

b) (0,8,15)

\rho = \sqrt{0^{2}+8^{2}+(15)^{2}} = 17

\phi = cos^{-1}(\frac{15}{17})

\theta = tan^{-1}\frac{y}{x}

The angle θ gives a tangent that doesn't exist. Analysing table of sine, cosine and tangent: θ = \frac{\pi}{2}

c) (√2,1,1)

\rho = \sqrt{(\sqrt{2} )^{2}+1^{2}+1^{2}} = 2

\phi = cos^{-1}(\frac{1}{2})

\phi = \frac{\pi}{3}

\theta = tan^{-1}\frac{1}{\sqrt{2} }

d) (−2√3,−2,3)

\rho = \sqrt{(-2\sqrt{3} )^{2}+(-2)^{2}+3^{2}} = 5

\phi = cos^{-1}(\frac{3}{5})

Since x < 0, use 2nd option:

\theta = \pi + tan^{-1}\frac{1}{\sqrt{3} }

\theta = \pi + \frac{\pi}{6}

\theta = \frac{7\pi}{6}

Cilindrical coordinate describes a 3 dimension space: 2 distances (r and z) and 1 angle (θ). To express cartesian coordinates into cilindrical:

r=\sqrt{x^{2}+y^{2}}

Angle θ is the same as spherical coordinate;

z = z

Calculating:

a) (4,2,-4)

r=\sqrt{4^{2}+2^{2}} = \sqrt{20}

\theta = tan^{-1}\frac{1}{2}

z = -4

b) (0, 8, 15)

r=\sqrt{0^{2}+8^{2}} = 8

\theta = \frac{\pi}{2}

z = 15

c) (√2,1,1)

r=\sqrt{(\sqrt{2} )^{2}+1^{2}} = \sqrt{3}

\theta = \frac{\pi}{3}

z = 1

d) (−2√3,−2,3)

r=\sqrt{(-2\sqrt{3} )^{2}+(-2)^{2}} = 4

\theta = \frac{7\pi}{6}

z = 3

5 0
3 years ago
I need the length of AC to the nearest 10th. If you can explain how you got it, that will be nice, but you don’t have too
Nezavi [6.7K]

Answer:

13.5

Step-by-step explanation:

\sin 64\degree = \frac{AC}{AB}\\\\AC = AB \sin 64\degree \\\\AC = 13.481910694\\\\AC \approx 13.5

4 0
3 years ago
Read 2 more answers
Given the Arithmetic Sequence 9,12,15,18,21,...find the formula
Georgia [21]

Answer:

#1

__________________________________________________________

6 0
3 years ago
Other questions:
  • -2b-6+3b-2 simplified
    9·2 answers
  • Outliners of the data
    5·1 answer
  • Name the set(s) of numbers to which –5 belongs
    11·2 answers
  • Please help me with this easy question...
    7·2 answers
  • If 21% of males and 15% of females in a given state play the guitar, what is the probability that a randomly selected subject in
    13·1 answer
  • Ashton plans to put a fence around his circular garden. When Ashton walks from one side of the garden to the other, through the
    10·1 answer
  • What is the perimeter of a square if the length of one of the diagonals is 12 cm?
    8·1 answer
  • Pls help!!!!!!!!!!!! :(<br> will give brainikes5wjj
    7·2 answers
  • Please hurry
    9·2 answers
  • Write a sine and cosine function that models the data in the table. I need steps to both the sine and cosine functions for a, b,
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!