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Vilka [71]
3 years ago
6

Can someone please help me​

Mathematics
1 answer:
ser-zykov [4K]3 years ago
5 0
The answer is - xsquared+4x-4 or -x2 the 2 is squared+4x-4
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Given equations A and B as 2/5x+y=12 and 5/2y-x=6 respectively which expression will eliminate the variable X a) 5/2A+2/5B b)5/2
frutty [35]

Answer:

C) A+\frac{2}{5}B

Step-by-step explanation:

Given Equations:

A) \frac{2}{5}x+y=12

B) \frac{5}{2}y-x=6

In order to eliminate x we need to multiply \frac{2}{5} to equation B and add it to A.

Multiplying \frac{2}{5} to B.

⇒ \frac{2}{5}\times (\frac{5}{2}y-x)=\frac{2}{5}\times 6

⇒ (\frac{2}{5}\times\frac{5}{2}y)-(\frac{2}{5}x)=\frac{12}{5}

⇒ y-\frac{2}{5}x=\frac{12}{5}

Adding it equation A.

   \frac{2}{5}x+y=12

+ -\frac{2}{5}x+y=\frac{12}{5}

We get 2y=\frac{72}{5}

Thus x is eliminated.

So, the expression used to eliminate x is:

A+\frac{2}{5}B

4 0
3 years ago
What is five hundred plus sixty thousand
Nesterboy [21]

Step-by-step explanation:

500+60000=60500

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4 0
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Find the area of the figure use 3.14 for pie
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A rectangular shaped pond is 16 meters long and 14 meters wide. The dimensions of a rectangular shaped lake nearby is 350%
aalyn [17]

Answer: 56 meters long and 49 meters wide

Step-by-step explanation:

Convert 350% to a decimal. 350% is 3.5. Each lenth is 3.5x larger than the original pond.

16*(3.5) =56 meters length

14*(3.5) = 49 meters width

56 meters long and 49 meters wide

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siniylev [52]
I will assume that is 19 2/5 INCHES.Set up a proportion with the actual height of the building.19.4 / h = 1/75Now, for cross-multiplying:H = 75 x 19.4 = 1455 feet.<span>That's a tall building!!!</span>
8 0
3 years ago
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