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Harman [31]
3 years ago
11

Midpoint of (-5,-1) and (2,-4)

Mathematics
1 answer:
7nadin3 [17]3 years ago
8 0

Answer:

(-1.5, -2.5)

Step-by-step explanation:

-5+2=-3

-3/2=-1.5

-1+-4=-5

-5/2=-2.5

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Suppose that y varies directly with x. Given x=4 when y=20.<br> Find y when x = 3
scoray [572]

Answer:

y = 15

Step-by-step explanation:

Given: y varies directly with x, x=4 when y=20

To find:  y when x = 3

Solution:

As y varies directly as x, it means that as x increases, y also increases by the same factor.

As y varies directly with x,

y=kx

Here, k is a constant

As x = 4 when y = 20,

20=4k\\k=\frac{20}{4}=5\\\Rightarrow y=5x

Put x = 3

y= 5(3) = 15

4 0
2 years ago
What is the mass of a solid ball of iron with a radius equal to 18 cm if it is known that the density of iron is 7800 kg/m
Shtirlitz [24]

Answer:

60.6528 kg

Step-by-step explanation:

Assuming the solid ball of iron is a sphere with a radius of 18 cm (or 0.18 m), we can compute the volume of the sphere:

V=\frac{4}{3}\pi r^3\\\\V=\frac{4}{3}\pi (\frac{18}{100})^3\\\\V=\frac{4}{3}\pi (0.005832)\\\\V=0.007776

Therefore, the volume of the solid ball is 0.007776 m³

Since we know that density is mass/volume, then we can find the mass of the iron:

\rho=\frac{mass}{volume}\\ \\7800\: kg/m^3=\frac{mass}{0.007776\: m^3}\\\\mass=60.6528\:kg

Thus, the mass of the solid ball of iron is 60.6528 kg

8 0
2 years ago
3,000 ÷ 50=300 ÷ 5 =?
Dvinal [7]
I’m guessing it’s 60
4 0
2 years ago
Simplify the ratio:<br> 18,750 : 216 =
aleksandr82 [10.1K]
The ratio to this problem is 750:216
5 0
2 years ago
Read 2 more answers
Teri ran 8 kilometers
viva [34]

Answer:

teri is tired

Step-by-step explanation:

from running

7 0
3 years ago
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