3 years ago

Solve the system by elimination 2x-3y=23 x+3y=-20

Mathematics

1 answer:

Fantom [35]3 years ago

4 0

Answer:

x = 1

y = -7

Step-by-step explanation:

2x-3y=23

+ x+3y =-20

3x + 0 = 3

x = 1

(1) + 3y = -20

-1 -1

3y = -21

y = -7

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murzikaleks [220]

Y='x'xk
6=1/3xk
K=18
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3 years ago

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Veronika [31]

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3 years ago

A) 37<br> b) 49<br> c) 46<br> d) 44

Anni [7]

I’m not sure but is it C? I’m so sorry if it’s wrong

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2 years ago

A rocket is launched from the top of a 55-foot cliff with an initial velocity of 138 ft/s.

melisa1 [442]

For this case we have that the equation that describes the height is:

$h = -16t ^ 2 + vt + c$

Where,

v: initial speed

c: initial height

Substituting values we have:

$h = -16t ^ 2 + 138t + 55$

Then, to find the time, we use the quadratic formula:

$t =\frac{-b +/-\sqrt{b^2 - 4ac} }{2a}$

Substituting values we have:

$t =\frac{-138 +/-\sqrt{138^2 - 4(-16)(55)} }{2(-16)}$

Rewriting:

$t =\frac{-138 +/-\sqrt{19044 + 3520} }{-32}$

$t =\frac{-138 +/-\sqrt{22564}}{-32}$

$t =\frac{-138 +/-150.21}{-32}$

We discard the negative root because we want to find the time.

We have then:

$t =\frac{-138 -150.21}{-32}$

$t =\frac{-288.21}{-32} \\t=9$

Answer:

D. $0 = -16t^2 + 138t + 55; 9 s$

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3 years ago

Based on the company's collection history, 2% of credit sales are uncollectible, 40% are collected in month of sale and the rema

Y_Kistochka [10]

Answer:

Therefore, option C is correct

Step-by-step explanation:

Budgeted cash receipts for February = 60000 + 303800*0.40 + 274400*.60

= 60000 +121520 + 164640

= 346160

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3 years ago