3 years ago

The sum of two numbers is

Mathematics

1 answer:

Artyom0805 [142]3 years ago

3 0

8 &16 have good luck .

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42x+25y=486, x+y=14 show work please help asap!

ruslelena [56]

Rewrite equations:
x+y=14;42x+25y=486

Step: Solvex+y=14for x:
x+y=14
x+y+−y=14+−y(Add -y to both sides)
x=−y+14

Step: Substitute−y+14forxin42x+25y=486:
42x+25y=486
42(−y+14)+25y=486
−17y+588=486(Simplify both sides of the equation)
−17y+588+−588=486+−588(Add -588 to both sides)
−17y=−102
−17y
−17
=
−102
−17
(Divide both sides by -17)
y=6

Step: Substitute6foryinx=−y+14:
x=−y+14
x=−6+14
x=8(Simplify both sides of the equation)

On Fri, Sep 20, 2019 at 12:08 PM ESQULESE BLACK wrote:

3 0

3 years ago

Find the sum of the first 8 terms of the sequence: -5. 15, -45, 135, .......

MakcuM [25]

Sum of geometric sequence

for the sum where the initial value is a₁ and the common ratio is r and the term is n

$S_n= \frac{a_1(1-r^n)}{1-r}$

common ratio is -3
-5 times -3 is 15, -15 times -3=-45 etc
first term is -5
and we want the 8th term

$S_8= \frac{-5(1-(-3)^8)}{1-(-3)}$
$S_8= \frac{-5(1-6561)}{1+3}$
$S_8= \frac{-5(-6560)}{4}$
$S_8= \frac{32800}{4}$
$S_8= 8200$

the sum is 8200

7 0

3 years ago

Electrical energy is converted into which three forms of energy by a hair dryer?

mylen [45]

Air energy
Heat energy
Kinetic energy

:-)

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3 years ago

Whats the sum of the interior angles of a 37 gon

Zinaida [17]

Since we have a 37-gon here, the sum of the interior angles will be:
(37 - 2) * 180 
= 6300 degrees

7 0

3 years ago

Can someone help me out with this

babymother [125]

The answer would be x= 68 degrees

7 0

2 years ago