2 years ago

3(x-4) + 2x - y2 for x = 5

Mathematics

1 answer:

Alborosie2 years ago

6 0

Answer:

there is some of it sorry cant realy help

Step-by-step explanation:

3x+2x=5x 5*5=25

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Find the coordinates of the midpoint of the segment given it’s endpoint M(-5, 9) and N(-2, 7)

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Given, M(-5,9) be x1 , y1

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2 years ago

Find the sum of a finite geometric sequence from n = 1 to n = 7, using the expression −4(6)n − 1.

Verizon [17]

Answer:

Step-by-step explanation:

The formula of a sum of terms of a gometric sequence:

$S_n=a_1\cdot\dfrac{1-r^n}{1-r}$

a₁ - first term

r - common ratio

We have

$a_n=-4(6)^{n-1}$

Calculate a₁. Put n = 1:

$a_1=-4(6)^{1-1}=-4(6)^0=-4(1)=-4$

Calculate the common ratio:

$r=\dfrac{a_{n+1}}{a_n}\\\\a_{n+1}=-4(6)^{n+1-1}=-4(6)^n\\\\r=\dfrac{-4(6)^n}{-4(6)^{n-1}}=6^n:6^{n-1}\\\\\text{use}\ a^n:a^m=a^{n-m}\\\\r=6^{n-(n-1)}=6^{n-n+1}=6^1=6$

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3 years ago