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Phoenix [80]
3 years ago
11

Given system 2x-4=5 5x+4y=2 Solve for x and y and SHOW ALL OF YOUR WORK

Mathematics
1 answer:
Georgia [21]3 years ago
5 0
I'm solving your system by substitution.
2x-4=5, 5x+4y =2
Step# 1: solve for x
2x - 4+ 4= 5 + 4( add +4 to both sides)
2x = 9
x = 9/2
Step# 2: solve for y

5(9/2) + 4y = 2
4y + 45/2 = 2 
4y 45
y = 45/4 = 11.25
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3 years ago
Solve the quadratic equation.<br>-7n^2=-448<br>​
Zolol [24]

Answer:

n = 8

Step-by-step explanation:

-7n² = -448

=> n² = -448 / -7

=> n² = 64

=> n = \sqrt{64}

=> n = 8

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2 years ago
The common ratio in a geometric series is 4 and the first term is 3.
kodGreya [7K]

Answer:

The sum of the first 8 terms in the series is 65535.

Step-by-step explanation:

We have,

The common ratio in a geometric series, r = 4

First term of GP is, a = 3

It is required to find the sum of the first 8 terms in the series. The sum of first n terms of a GP is given by :

S_n=\dfrac{a(r^n-1)}{r-1}, r>1

Here, n = 8

S_8=\dfrac{3\times ((4)^8-1)}{4-1}\\\\S_8=65535

So, the sum of the first 8 terms in the series is 65535.

3 0
2 years ago
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ryzh [129]

Answer:

I think it would be 3/4. You have to add them in a calculator.

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3 years ago
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Step-by-step explanation:

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