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wel
3 years ago
12

Anybody pls solve this question and explanation btw.​

Mathematics
1 answer:
kondaur [170]3 years ago
5 0

Answer:

Vol=883.6875\,\, cm^3\\

Step-by-step explanation:

Recall that the volume of a whole sphere is given by the formula:

Vol_{sphere}=\frac{4}{3} \pi\,R^3

then, the volume of a semi-sphere would be half of the formula above:

Vol=\frac{2}{3}\, \pi\,R^3

Now, the radius R is given by half of the semi-sphere diameter: 15/2 = 7.5 cm.

which makes our calculation:

Vol=\frac{2}{3}\, \pi\,R^3=\frac{2}{3}\, \pi\,(7.5\,cm)^3=883.6875\,\, cm^3\\

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When 5 is subtracted from the square of a number, the result is 4 times the number. Find the negative solution.
wariber [46]

Answer:

-1

Step-by-step explanation:

You can write it as...

x^{2} -5=4x

Carry the 4x

x^{2} -4x-5=0

Then use the quadratic formula to solve, since you want to find the negative solution, you don't need to find the positive solution, so we will have

(4-\sqrt{16+20}) /2=\frac{4-6}{2}=\frac{-2}{2} =-1

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8 0
3 years ago
15 and 17 pls.. 15 points!!!!
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Step-by-step explanation:

15) 50 ÷ 2 = 25

17) Mean = 301, Mode = 40-50

(10+20) ÷ 2 = 15, (20+30) ÷ 2 = 25, (30+40) ÷ 2 = 35

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(70+80) ÷ 2 = 75

• 15×4 = 60, 25×8 = 200, 35×10 = 350, 45×12 = 540

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Mean = (60+200+350+540+550+260+150) ÷ 7

= 2110 ÷ 7

= 301.4285....

= 301

Mode : the highest frequency

3 0
3 years ago
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Click on the words to go to the picture
balu736 [363]
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