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Scilla [17]
3 years ago
11

Help me plz i have 3 question 30 points

Mathematics
1 answer:
Vlad1618 [11]3 years ago
3 0
Here're the answers!!! Good luck!!
1) a = -7 (The first picture -Left to right)
2) x = -39
3) a = -2.1 (The last picture left to right)


Hoping this helped you out!! If my answer best helped you, please mark Brainliest! ;)

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The volume of a spherical tank is 790.272 pie cubic feet what is the diameter of the container
pochemuha

Answer:

The diameter is 13.88 feet.

Step-by-step explanation:

1. The formula for calculate the volume of a sphere is:

V=\frac{3}{4}(r^{3}\pi)

Where r is the radius.

2. The diameter is:

D=2r

3. So, you must solve for the radius in the first equation:

r=\sqrt[3]{\frac{4V}{3\pi}} 

r=\sqrt[3]{\frac{4(790.272ft^{3} )}{3\pi}}\\r=6.94ft

4. Then, the diameter is:

D=2(6.94ft)\\D=13.88ft


8 0
3 years ago
A set of piano prices distributed at a mean of 3000 and a standard deviation of 200 dollars. An electric piano has a price of 25
lana [24]

Answer:

The proportion of piano prices higher than the electric piano is 98.3%

Step-by-step explanation:

The first thing to do here is to calculate the standard score of the price of the electric piano given.

Mathematically, this is

z-score = (x-mean)/SD

where mean is 3000 and SD is 200, x is 2576

z-score = (2576-3000)/200 = -2.12

Now we proceed to calculate the probability of this z-score

The probability we are trying to calculate is

P( x > $2576) or simply P ( z > -2.12)

Using standard score probability calculator or table, we have

P(x>2576) = 1 - P(x<2576)

But, P(x<2576) = 0.017003

P(x>2576) = 1 - P(x<2576) = 0.983

This is same as 98.3%

4 0
3 years ago
For which points is the y coordinate less that -1.5
Masja [62]
The bottom 2.

I can’t see the point names cause its blurry but those bottom 2 points should be the answers.

Y coordinates are how high or low
X coordinates are how far left or right

Brainliest if this helps?
3 0
2 years ago
Justine answered 68 questions correctly on and 80 question test. Express this amount as a fraction percent and decimal
kupik [55]

Answer: 0.85 or %85

Fraction = 68 over 80 divide by two twice 17 over

                                                           20

Percent = 68/80 = 0.85 x 100 = 85%

Decimal =  0.85

3 0
2 years ago
Read 2 more answers
How many irrational numbers are there between 1 and 6 ?
marshall27 [118]
00000000000000000000000000000000000000
5 0
3 years ago
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