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dmitriy555 [2]
3 years ago
15

375 A system of equations is shown below.

Mathematics
1 answer:
jolli1 [7]3 years ago
8 0
B is the one I would go with, multiplying everything by 3 in the equation 3 would eliminate y.
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-3 = За +6<br> Solve 2-step equations
Vaselesa [24]

Answer:

a=-3

Step-by-step explanation:

-3a=6+3

-3a=9

a=-3

7 0
3 years ago
Sand for use on icy roads is stored in a conical pile 14.2 m high and with a base diameter of 34.4 m calculate the volume of the
sammy [17]

Answer:

1. The volume of the pile is 4,399.7719 m^3

2. The number of sanders to be filled from a pile is 638

Step-by-step explanation:

Here, we firstly would calculate the volume of the pile

Mathematically, that will be;

V = 1/3 * pi * r^2 * h

from the question, h = 14.2

Mathematically, r = d/2

r = 34.4/2 = 17.2 m

So the volume will be:

V = 1/3 * 3.142 * 17.2^2 * 14.2

V = 4,399.7719 m^3

To find the number of sanders to be filled,

we simply divide the volume obtained by the volume a sander can take

That will be;

4,399.7719/6.9

= 637.6 which is 638

4 0
3 years ago
2+x=15-7/8x how do you solve this?
uranmaximum [27]

Answer:2+x=15-7/8x

We move all terms to the left:

2+x-(15-7/8x)=0

Domain of the equation: 8x)!=0

x!=0/1

x!=0

x∈R

We add all the numbers together, and all the variables

x-(-7/8x+15)+2=0

We get rid of parentheses

x+7/8x-15+2=0

We multiply all the terms by the denominator

x*8x-15*8x+2*8x+7=0

Wy multiply elements

8x^2-120x+16x+7=0

We add all the numbers together, and all the variables

8x^2-104x+7=0

a = 8; b = -104; c = +7;

Δ = b2-4ac

Δ = -1042-4·8·7

Δ = 10592

The delta value is higher than zero, so the equation has two solutions

We use following formulas to calculate our solutions:

x1=−b−Δ√2ax2=−b+Δ√2a

The end solution:

Δ−−√=10592−−−−−√=16∗662−−−−−−−√=16−−√∗662−−−√=4662−−−√

x1=−b−Δ√2a=−(−104)−4662√2∗8=104−4662√16

x2=−b+Δ√2a=−(−104)+4662√2∗8=104+4662√16

Step-by-step explanation:

5 0
3 years ago
What number Property is demonstrated?
marusya05 [52]
Associate of multiplication I think
3 0
4 years ago
A store pays $81 for a hockey stick and marks the price up by 5%. What is the amount of the mark-up?
OlgaM077 [116]
.05 is equal to 5%
So for every dollar the mark up is .05cents
So if you times $81 by .05 this will give you the mark up because each of the 81$ needs .05 added to it.

So $4.05 Is the mark up

And

The cost would be markup and original added together
4 0
3 years ago
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