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Liono4ka [1.6K]
2 years ago
11

The surface area of a cone with radius r units and slant height s units is shown below:

Mathematics
1 answer:
Diano4ka-milaya [45]2 years ago
7 0

Step-by-step explanation:

part A:

Area_{_{surface}}=3.14*(3*5+3^2);

part B:

Area_{_{surface}}=3.14*(15+9)=3.14*24=75.36[units^2].

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What is the rule for finding the vertex of a formula in Standard form? Use that rule to
worty [1.4K]

The vertex is the minimum or the maximum point of the parabola.

<em>x and f(x) represent the horizontal and the vertical coordinates of the vertex.</em>

<em />

The standard form of a parabola is

f(x) = ax^2 +bx + c

The x coordinate of the parabola is calculated using:

x  =-\frac{b}{2a}

The value of the x-coordinate is then plugged in, into the equation to calculate the y-coordinate, as follows:

f(\frac{b}{2a}) = a(-\frac{b}{2a})^2 + b(-\frac{b}{2a}) + c

At the end of the calculation,

x and f(x) represent the horizontal and the vertical coordinates of the vertex.

Take for instance:

f(x) = 2x^2 + 4x - 9

The x-coordinate of the vertex is:

x = -\frac b{2a}

x = -\frac 4{2 \times 2}

x = -\frac 44

x=-1

The y-coordinate is:

f(x) = 2x^2 + 4x - 9

f(-1) =2 \times (-1)^2 + 4 \times -1 - 9

f(-1) =-11

So, the vertex of f(x) = 2x^2 + 4x - 9 is (-1,11)

See attachment for illustration of vertex of f(x) = 2x^2 + 4x - 9

Read more about vertex of parabola at:

brainly.com/question/20209326

5 0
2 years ago
Does anyone know how to do this?? thanks x
Gre4nikov [31]

There's a simple formula for the area of an ellipse:  pi*a*b, where a and b are , half the lengths of the long axis and the short axis respectively.

Here, A = pi*(12 ft)(4 ft) = 48 pi ft^2, or about 150.8 ft^2.

3 0
3 years ago
Which graph best represents the equation x^2 + (y - 1)^2 = 3?
bulgar [2K]

Answer:

smallest circle. last option

Step-by-step explanation:

6 0
3 years ago
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Timmy used to practice the violin for 60 minutes everyday. Now, he practices 135% as many minutes as he used to. How many minute
Neporo4naja [7]

Answer:

81

Step-by-step explanation:

You need to work out 35% and add it to 100% to make 135%

To do that you work out 10% and multiply it by 3 to give you 30%. After that you need to work out 5% and add it to the 30%. You can work out 5 %by dividing the answer you get for 10%

100%=60 minutes

10%=6

30%=18

5%=3

35%=21

60+21=81 minutes

8 0
4 years ago
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How do I substract 7/10 minus 3/15
Bond [772]

Answer: 0.5

Step-by-step explanation:

To reduce a fraction: divide the numerator and denominator by their greatest common factor, GCF.

Fraction: 7/10 already reduced to the lowest terms.

The numerator and denominator have no common prime factors.

Their prime factorization:

7 is a prime number;

10 = 2 × 5;

gcf (7; 2 × 5) = 1;

4 0
3 years ago
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