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Vladimir [108]
3 years ago
11

Find SD if JD=30. Pls help meh.

Mathematics
1 answer:
Effectus [21]3 years ago
8 0

Answer:

SD=10

Step-by-step explanation:

S=the intersection of the medians

SD=JD/3

SD=30/3

SD=10

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What is 2x-3y=9<br> -5x-3y=30
Shkiper50 [21]
If your in algebra 1 then i'm pretty sure you subtract the 2x and that cancels and subract the 2x with the 9 and you have -3y= -2x+9 so you divide -3 to the -3y, the -2x and positive 9 and your answer will be y=2/3x-3
3 0
3 years ago
Read 2 more answers
The circumference of a sphere was measured to be 90 cm with a possible error of 0.5 cm.
Akimi4 [234]

Answer:

Error in the sphere's surface: 29 cm^2  and relative error in surface measure: 0.011

Error in the sphere's volume: 205 cm^3 and relative error in the volume measure: 0.017

Step-by-step explanation:

(a)

The measured length (l) of the circumference is 90 cm with an error of 0.5 cm, that is:

l=2\,\pi\,R=90\,cm\\R=\frac{90}{2\,\pi} \,cm=\frac{45}{\pi} \,cm=14.3239\,\,cm

and with regards to the error:

dl=0.5 \, cm\\dl=2\,\pi\,dR\\dR=\frac{dl}{2\,\pi} =\frac{1}{4\,\pi} cm = 0.0796\,cm

then when we use the formula for the sphere's surface, we get:

S=4\,\pi\,R^2\\dS=4\,\pi\,2\,R\,(dR)\\dS=8\,\,\pi\.(\frac{45}{\pi} \,\,cm)\,(\frac{1}{4\pi}\,cm) =\frac{90}{\pi} \,\,cm^2\approx \,29\,cm^2

Then the relative error in the surface is:

\frac{dS}{S} =\frac{90/\pi}{4\,\pi\,R^2} =\frac{1}{90} =0.011

(b)

Use the formula for the volume of the sphere:

V=\frac{4\,\pi}{3} R^3\\dV=\frac{4\,\pi}{3}\,3\,R^2\,(dR)=4\,\pi\,R^2\,(\frac{1}{4\pi}) \,cm=(\frac{45}{\pi})^2 \,\,cm^3\approx 205\,\,cm^3

Then the relative error in the volume is:

\frac{dV}{V} =\frac{205}{12310.5} \approx 0.017

3 0
3 years ago
The sum of two numbers is 44 and the difference is 14. What are the numbers?
Fudgin [204]

Answer:

Hope it may help u

Step-by-step explanation:

The sum of two numbers is 44 and their difference is 14. What are the two numbers? Let's start by calling the two numbers we are looking for x and y.

The sum of x and y is 44. In other words, x plus y equals 44 and can be written as equation A:

x + y = 44

The difference between x and y is 14. In other words, x minus y equals 14 and can be written as equation B:

x - y = 14

Now solve equation B for x to get the revised equation B:

x - y = 14

x = 14 + y

Then substitute x in equation A from the revised equation B and then solve for y:

x + y = 44

14 + y + y = 44

14 + 2y = 44

2y = 30

y = 15

Now we know y is 15. Which means that we can substitute y for 15 in equation A and solve for x:

x + y = 44

x + 15 = 44

X = 29

Summary: The sum of two numbers is 44 and their difference is 14. What are the two numbers? Answer: 29 and 15 as proven here:

Sum: 29 + 15 = 44

Difference: 29 - 15 = 14

6 0
3 years ago
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A van travels 150 miles on 6 gallons of gas. How many gallons will it need to travel 325 miles?
diamong [38]

Answer:

C. 13 gallons

Step-by-step explanation:

150 divided by 6 is 25. 325 divided by 25 is 13.

8 0
3 years ago
A fair die is rolled 11 times. What is the probability of rolling a 4 on the die 4 times? Express your answer as a decimal round
svet-max [94.6K]

i think it’s 4/11

check out my other answers and mark me brainliest please !!!!

7 0
3 years ago
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