3 years ago

Find x and I will give you brainliest answer award and 10 points

Mathematics

1 answer:

sasho [114]3 years ago

6 0

Answer: x = 6

Formula: $(x+5)=11$

Step-by-step explanation:

We know that an area of a triangle is half of a rectangle.

The bottom side must equal 11, since if the figure was a rectangle, the area would be multiplied by 2, giving us 44.

What minus 5 equals 11?

So x must equal 6.

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Consider the series 4 + 12 + 36 ... Find the sum of the first 9 terms.

jeyben [28]

Answer:

39364

Step-by-step explanation:

You can simplify the equation to make 4(1+3+9...) The nth term is therefore $3^{n-1}$ so u can substitute that into the equation so 4( $3^{n-1}+ 3^{n} + 3^{n+1}$ ..). This would simplify to 4( $3^0 +3+3^2$ + $3^3+3^4+3^5+3^6+3^7+3^8$ ). By simplifying this, you can make it so 4( $2^2+6^2+18^2+42^2+81^2$ ) = 4(4+36+324+2916+6561) =39364