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ladessa [460]
3 years ago
13

Factorise completely. 21a²+28ab​

Mathematics
1 answer:
Rina8888 [55]3 years ago
6 0
I think it’s 7a(3a+4b)
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Which of the following is/are cube(s) of even number (i) 249 (ii) 50653
irinina [24]

Answer:

None (If there are just these two options i.e, 249 and 50653. I think there are more options, anyway)

Step-by-step explanation:

Cubes of even numbers are even and cube of odd numbers are odd.

Since both the numbers are odd, both of their cubes must be odd too.

Thank You

Hope this helps you

Please mark as brainliest

5 0
3 years ago
Solve for the following system by using Elimination4x-2y=86x+6y=30
Ilia_Sergeevich [38]

System

\begin{gathered} 4x-2y=8 \\ 6x+6y=30 \end{gathered}\begin{gathered} 3(4x-2y)=8 \\ 6x+6y=30 \\  \\ 12x-6y=24 \\ + \\ 6x+6y=30 \\  \\ 12x+6x-6y+6y=24+30 \\ 18x=54 \\ x=3 \end{gathered}

Now, for y

\begin{gathered} 4x-2y=8 \\ -2y=8-4x \\ 2y=4x-8 \\ y=\frac{4x-8}{2} \\ y=\frac{4\cdot3-8}{2} \\ y=\frac{12-8}{2} \\ y=\frac{4}{2} \\ y=2 \end{gathered}

3 0
1 year ago
A school marching band has 200 members.There are 50 band members who play brass instruments.What percent of the band members pla
andrew11 [14]

Answer:

25% Or

1/4 Or

0.25

Step-by-step explanation:

Solve:

200 divided by 50 is 4

Check your math:

50*4= 200

Your only counting a single piece of this whole. This can be written in 3 ways, 25%, 1/4, or 0.25.

Hope this helps!

4 0
3 years ago
Read 2 more answers
The image of the point ( 0 , 7 ) (0,7) under a translation is ( − 2 , 5 ) (−2,5). Find the coordinates of the image of the point
avanturin [10]

Given:

The image of the point (0,7) under a translation is (−2,5).

To find:

The coordinates of the image of the point (5,−2) under the same translation.

Solution:

It is given that, the image of the point (0,7) under a translation is (−2,5). Here, the x-coordinate decreased by 2 and the y-coordinate decreased by 2 so the rule of translation is:

(x,y)\to (x-2,y-2)

Using this rule of translation, the image of (5,−2) is

(5,-2)\to (5-2,-2-2)

(5,-2)\to (3,-4)

Therefore, the coordinates of the image of the point (5,−2) under the same translation are (3,-4).

8 0
3 years ago
The midpoint of a line segment is (-1, 4). The endpoints of the line segment are (3, y) and (-5, 10). What is the value of y?
viktelen [127]

Answer:

  -2

Step-by-step explanation:

The midpoint is the average of the end point coordinates, so ...

  4 = (y +10)/2 . . . . the y-coordinate is the average of the y-coordinates

  8 = y +10 . . . . . . . multiply by 2

  -2 = y . . . . . . . . . . subtract 10

8 0
3 years ago
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