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White raven [17]
3 years ago
7

Using the expression 10 x 2/5 as an example, describe how to multiply a whole number by a fraction that is less than one.

Mathematics
2 answers:
Schach [20]3 years ago
5 0
To multiply a whole number by a fraction less than one, you have to rewrite the whole number in the expression as a fraction by putting a one under it.
For example, in 10 x 2/5, you would rewrite the 10 to 10/1 x 2/5.
Then, you would multiply the top and bottom of the two fractions. In this case, it would be 10 x 2 and 1x5. This would result in 20/5.
Finally, you would simplify this fraction by dividing. The final answer is 4.
sergiy2304 [10]3 years ago
4 0

Answer:

10 × 2/5 = 20/5 = 4

Step-by-step explanation:

When you are multiplying a whole (big) number times a fraction, you multiply the whole (big) number times the TOP number (numerator) and put that on top. Keep the bottom number (denominator) the same.

10 × (2/5)

= (10×2) / 5

= 20/5

= 4

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The string of a kite is 100 meters long and it makes an angle of 60° with the ground. What is the height of the kite?
Naddika [18.5K]

Answer:

  50√3 ≈ 86.6 m

Step-by-step explanation:

The geometry can be modeled by a right triangle with the height of the kite being the leg opposite the 60° angle. The hypotenuse has the given length of 100 m.

The mnemonic SOH CAH TOA reminds you that the relation between angles and the sides of interest here is ...

  Sin = Opposite/Hypotenuse

  sin(60°) = (kite height)/(100 m)

  kite height = (100 m)·sin(60°) = (100 m)(√3)/2

  kite height = 50√3 m ≈ 86.6 m

7 0
3 years ago
Write the equation 12y = 4x + 1 in standard form.
ivann1987 [24]

Answer:

4x - 12y = -1

Step-by-step explanation:

Standard form Ax +By = C

12y = 4x + 1

0 = 4x - 12y +1            Substract 12y from both sides

-1 = 4x - 12y  as  4x - 12y = -1      Substract -1 from both sides

5 0
3 years ago
Hey if anyone could help me solve this that be awesome :D
Montano1993 [528]
I'm here to help.  Those 3 points all lie on the same line.  We know this because if we find the slope between any 2 of those points, it is the same.  I'll show you: m= \frac{12-20}{15-10}=- \frac{8}{5}.  Now another 2 points: m= \frac{4-12}{20-15}=- \frac{8}{5}.  The same holds for the first and third points.  So we got that out of the way.  Now we will pick any one of those points and use the x and y values and our slope to write an equation of that line and then finally solve for the x and y intercepts.  I'm going to use the first point (10, 20): y-20=- \frac{8}{5}(x-10).  We will simplify to get it into y = mx + b form: y-20=- \frac{8}{5}x+ \frac{80}{5} and y-20=- \frac{8}{5}x+16 and finally, y=- \frac{8}{5}x+36.  The y-intercept exists when x = 0, so when x = 0, y = 36.  The x-intercept exists when y = 0, so when y = 0, x = 22.5.  In summary, y-intercept: (0, 36).  x-intercept: (22.5, 0)  and you're all done!
7 0
3 years ago
Read 2 more answers
Sam rotated parallelogram ABCD 90° clockwise around the origin. If angle A is 130° and angle B is 50°, what is the degree measur
irakobra [83]

<u>Answer-</u>

The measurement of angle A' will be 130° .

<u>Solution-</u>

Transformations like - rotations, reflections, and translations are isometric.  That means that these transformations do not change the size of the figure.  If the size and shape of the figure is not changed, then the figures are congruent.

It doesn't matter the order or how much degree of rotation has taken place, the final image will be congruent to the original image.

So, even after the rotation of 90° clockwise around the origin, the measurement of angle A will be 130° and so do all the rest of the angles.



8 0
3 years ago
Read 2 more answers
Simplify: (4x2 − 8xy + 2y2) − (9x2 − 4xy − 7y2) (5 points)
ivann1987 [24]

Answer:

Here you go

-5x2 − 4xy + 9y2

Hope this helps



6 0
4 years ago
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