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lana [24]
3 years ago
12

Please can someone help me with this

Mathematics
2 answers:
SashulF [63]3 years ago
5 0

Answer:

Step-by-step explanation:

4/3×22/7×4.7^3=435.1cm

Eduardwww [97]3 years ago
4 0

Answer:

\boxed{V = 434.9 \ cm^3 }

Step-by-step explanation:

Volume of Sphere = \frac{4}{3} \pi r^3

Where r = 4.7 cm

V = \frac{4}{3} (3.14)(4.7)^3

V = \frac{4}{3} (3.14)(103.8)

V = \frac{1304.7}{3}

V = 434.9 cm³  (Up to 1 dp)

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Find 2x2 − 2z4 + y2 − x2 + z4 if x = −4, y = 3, and z = 2.<br><br> Is -3 the correct answer?
Ket [755]
We're given the algebraic expression 2x^2 - 2z^4 + y^2 - x^2 + z^4

By hypothesis, x = -4, y = 3 and z = 2

Let's replace each letter by its given value:

2x^2 - 2z^4 + y^2 - x^2 + z^4
2(-4)^2 - 2(2)^4 + (3)^2 - (-4)^2 + (2)^4
(2*16) - 2*16 + 9 - 16 + 16
32 - 32 + 9 - 16 + 16
9

So wrong. The correct answer is not -3, but 9.

Hope this helps! :D
6 0
3 years ago
A person can walk 3 1/4 miles in one hour. How many miles can the person walk in 1 3/4 hours?
weqwewe [10]
Since Emily is walking at a constant speed, we can solve this using proportions, equating ratios of distance/time.

The first ratio is 3/4 miles/1/4 hour
The second ratio is 1 mile/ x hour

Equating the two ratios: 3/4 / 1/4 = 1/x
3 = 1/x
x = 1/3 hour
3 0
3 years ago
Express 45 minutes as a fraction of 1 hour ​
Pepsi [2]

Answer:

\frac{3}{4}

Step-by-step explanation:

There are 60 minutes in 1 hour

To express as a fraction

\frac{45}{60}

Divide numerator/denominator by 15

\frac{45}{60} = \frac{3}{4}

8 0
3 years ago
Identify the sequence as arithmetic, geometric, or neither. Explain your work.
Gnesinka [82]
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4 0
3 years ago
Louisa ran at an average speed of five miles per hour along an entire circular park path. Calvin ran along the same path in the
docker41 [41]

Answer:

15 miles

Step-by-step explanation:

Let x be the miles in the circular park path, t_{L} the time Louisa takes to finish and t_{C} the time Calvin takes to finish both in hours.

Then x, the longitude is equal to the velocity times the time used to finish. So

x=5t_{L}

x=6t_{C}

And the difference between Louisa's time and Calvin' time is 30 minutes, half an hour. So:

t_{C}=t_{L}-0.5

Three equations, three unknowns, the system can be solved.

Equalizing the equation with x :

5t_{L}=6t_{C}

In this last equation replace t_{C}  with the other equation and solve:

5t_{L}=6(t_{L}-0.5)\\ 5t_{L}=6t_{L}-3\\ 3=6t_{L}-5t_{L}\\ 3=t_{L}\\ t_{L}=3

With Louisa's time find x:

x=5t_{L}\\ x=5(3)\\ x=15

7 0
2 years ago
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