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2 years ago

PLSSSSSSSSSSSSSSSSSSSS HELPPPPPPPPPPPPPPPPPPP

Mathematics

1 answer:

nirvana33 [79]2 years ago

6 0

Answer:

The second one.

Step-by-step explanation:

Let’s look at this.

first of all, when inequalities have a greater than or equal to, the dot is filled in. Thisis just less that, so an open dot will work.

In the inequality n<-3, n is less than negative three, so it’s starts at -3 and goes to the left.

hope this helps!

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8* x + y + y; use x=9, and y = 10

katrin [286]

Answer:

Step-by-step explanation:

8* x + y + y

Where

x=9, and y = 10

Solution=8×9+10+10

=72+20

=92.

So the answer is 92

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Fine the equation, in standard form, of the line passing through the points (3,-4) and (5,1)

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The point-slope form:

$y-y_1=m(x-x_1)\\\\m=\dfrac{y_2-y_1}{x_2-x_1}$

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3 years ago

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"a u.S. 1-cent coin (a penny) has a diameter of 19 mm and a thickness of 1.5 mm". Assume the coin is made of pure copper, whose

choli [55]

the question is Calculate the value of the copper in the coin

Step 1

Find the volume of the coin

we know that

the volume of a cylinder is equal to

$V=\pi r^{2}h$

where

r is the radius of the coin

h is the thickness of the coin

in this problem we have

Diameter=19 mm=1.9 cm

r=D/2------> r=1.9/2=0.95 cm

h=1.5 mm=0.15 cm

substitute the values in the formula

$V=\pi*0.95^{2}*0.15=0.425\ cm^{3}$

Step 2

Find the mass of copper in the coin

we know that

the density is equal to

$Density=mass/volume$

Solve for the mass

$mass=Density*volume$

we have

$Density=8.9\ gr/cm^{3}\\Volume=0.425\ cm^{3}$

substitute in the formula

$mass=8.9*0.425=3.785\ gr$

Step 3

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we know that

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3 years ago

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Salsk061 [2.6K]

Answer:

a₂ = -3

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Step-by-step explanation:

We have to insert two arithmetic means between -5 and 1

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-5, a₂, a₃, 1

Here,

a₄ = 1

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We know that the nth term of an Arithmetic sequence

aₙ = a₁ + (n-1)d

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1 = -5 + 3d

1 + 5 = 3d

3d = 6

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d = 2

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a₂ = a₁ + (2-1)d

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a₂ = -5 + 2 ∵ d = 2

a₂ = -3

a₃ = a₁ + (3-1)d

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a₃ = -5 + 4

a₃ = -1

Thus,

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a₃ = -1

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-5, -3, -3, 1

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