3 years ago

Write an expression that can be used to find 4x275 using mental math and properties of numbers

Mathematics

1 answer:

Vikki [24]3 years ago

8 0

4x200
4x70
4x5
then add it all together

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Solve the system of linear equations below y=-2x+19 y=x+7

Julli [10]

<span>A) y=-2x+19
B) y=x+7 Multiplying B) by -1
B) -y = -x -7 then adding it to A)
A) y = -2x + 19
3x = 12
x = 4
y = 11

</span>

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3 years ago

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Is 4/6 and 6/12 equivalent

larisa86 [58]

4/6
= (4/2) / (6/2)
= 2/3

6/12
= (6/6) / (12/6)
= 1/2

Because 2/3 ≠ 1/2, 4/6 and 6/12 are NOT equivalent.

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3 years ago

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Does this graph represent a function? <br>A=Yes <br>B=No

RSB [31]

Answer: no

Step-by-step explanation:

it doesn't pass the vertical line test

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3 years ago

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An aquarium has dimensions 2x feet, (x – 1) feet, and (x + 2) feet. The aquarium volume must be no more than 280 cubic feet.

Lina20 [59]

Answer:

$x^3+x^2-2x\leq140$

Step-by-step explanation:

This is an algebra problem, and we are expected to inequality for the volume of the aquarium.

Given that the

length= 2x

width=(x – 1)

heigth= (x + 2)

and the volume= 280 ft^3

the inequality expression for the volume is

$2x*(x -1) * (x + 2) \leq 280\\\\$

open the brackets

$2x*(x -1) * (x + 2) \leq 280\\\\(2x^2-2x)*(x+2)\leq 280\\\\\2x^3+4x^2-2x^2-4x\leq 280\\\\\2x^3+2x^2-4x\leq280$

divide through by 2 we have

$x^3+x^2-2x\leq140$

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3 years ago

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Kim has worked in the tech industry for some time and would like to start consulting. In opening her new business, she will need

zimovet [89]

Cost of 3 laptops
3×546.78
=1,640.34
Cost of 2 desktop computer
2×1,255.99
=2,511.98
Cost of fax machine
125.99
Total cost
(1,640.34+2,511.98+125.99)
=4,278.31
So Kim will need an additional 778.31 to start her business
4,278.31−3,500
=778.31

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3 years ago

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