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melomori [17]
3 years ago
9

math:John is buying new shoes. He finds the shoes he wants on sale for 30%, and the original price is $88. How much will he pay

for the shoes?
Mathematics
2 answers:
ra1l [238]3 years ago
4 0

Answer:

26.4

Step-by-step explanation:

hd hd hd hd hd hd hd hd hd hd hd hd

guajiro [1.7K]3 years ago
3 0

Answer:$61.6

Step-by-step explanation: The sale is 30% so we have to look for 70% of $88 because that's what we're paying for. So, that would be 88 times 70/100 which ends with 61.6.

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Find the area of a square with a perimeter of 45cm
Stolb23 [73]

Answer:

the area for the square is 126.56cm²:

8 0
3 years ago
A right circular cylinder is inscribed in a sphere with diameter 4cm as shown. If the cylinder is open at both ends, find the la
SOVA2 [1]

Answer:

8\pi\text{ square cm}

Step-by-step explanation:

Since, we know that,

The surface area of a cylinder having both ends in both sides,

S=2\pi rh

Where,

r = radius,

h = height,

Given,

Diameter of the sphere = 4 cm,

So, by using Pythagoras theorem,

4^2 = (2r)^2 + h^2   ( see in the below diagram ),

16 = 4r^2 + h^2

16 - 4r^2 = h^2

\implies h=\sqrt{16-4r^2}

Thus, the surface area of the cylinder,

S=2\pi r(\sqrt{16-4r^2})

Differentiating with respect to r,

\frac{dS}{dr}=2\pi(r\times \frac{1}{2\sqrt{16-4r^2}}\times -8r + \sqrt{16-4r^2})

=2\pi(\frac{-4r^2+16-4r^2}{\sqrt{16-4r^2}})

=2\pi(\frac{-8r^2+16}{\sqrt{16-4r^2}})

Again differentiating with respect to r,

\frac{d^2S}{dt^2}=2\pi(\frac{\sqrt{16-4r^2}\times -16r + (-8r^2+16)\times \frac{1}{2\sqrt{16-4r^2}}\times -8r}{16-4r^2})

For maximum or minimum,

\frac{dS}{dt}=0

2\pi(\frac{-8r^2+16}{\sqrt{16-4r^2}})=0

-8r^2 + 16 = 0

8r^2 = 16

r^2 = 2

\implies r = \sqrt{2}

Since, for r = √2,

\frac{d^2S}{dt^2}=negative

Hence, the surface area is maximum if r = √2,

And, maximum surface area,

S = 2\pi (\sqrt{2})(\sqrt{16-8})

=2\pi (\sqrt{2})(\sqrt{8})

=2\pi \sqrt{16}

=8\pi\text{ square cm}

4 0
3 years ago
Equivalent expression of x+4+3x
Andreas93 [3]

Answer:

4x+4

Step-by-step explanation:

Combine like terms:

3x+x= 4x

Add remaining terms (+4)

4x+4

4 0
3 years ago
Which expression is equivalent to..?
grigory [225]
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6 0
3 years ago
Read 2 more answers
I dont get it i tried working on it and its hard
olga55 [171]
On the cube, it measures in numerical order 1 to 6, so:
1,2,3,4,5,6.
We are finding how much red fabric was used for even numbered sides.

So we are looking for sides 2,4,6

Since 20 in. is measured on a side, we can determine the area: 20*2= 40 in.^2 (all sides are same and length*width)

Now we have how much fabric is used on each side, so apply the area to all the even numbers (2,4,6)

40*3= 120 inches
3 0
3 years ago
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