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3 years ago

If edge of cube is reduced by 25%.find the percentage decrease in its total surface area.

Mathematics

1 answer:

vlada-n [284]3 years ago

8 0

%75 I guess unless this is like highschool math

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Your are designing a rectangular birthday card for a friend. You want the card's length to be 1 inch more than twice the card's

klemol [59]

The width of the card to the nearest tenth of an inch is 6.15 inches

<h3>Area of rectangle</h3>

Width = x
Length = 2x + 1
Area = 88 square inches

Area of a rectangle = Length × Width

88 = (2x + 2) × x

88 = 2x² + 2x

2x² + 2x - 88 = 0

x = -b ± √b² - 4ac / 2a

= -2 ± √2² - 4(2)(-88) / 2(2)

= -2 ± √4 - (-704) / 4

= -2 ± √708 / 4

= -1/2 ± √177/2

x = 6.15 or -7.15 inches

The width of the rectangle can not be negative, so, 6.15 inches is the width.

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2 years ago

Brooke collects porcelain dolls and teddy bears. Over the years, the number of porcelain dolls she collected is 14 less than twi

Colt1911 [192]

Teddy =X
Dolls= 2x-14

2x-14+X=52
3X-14=52
Add 14
3X=66
Divide by 3
X= 22

Teddy are 22
Dolls 2(22)-14=30

5 0

3 years ago

a. Among a shipment of 5,000 tires, 1,000 are slightly blemished. If one purchases 10 of these tires, what is the probability th

hodyreva [135]

Answer:

<h2>See the explanation.</h2>

Step-by-step explanation:

3 or less than 3 tires among the 10 tires should be blemished.

There are some possibilities.

1000 tires are blemished, (5000 - 1000) = 4000 tires are not blemished.

From the 5000 tires, 10 tires can be chosen in $^{5000}C_{10}$ ways.

Possibility 1: <u>3 tires are blemished.</u>

Total 10 tires can be chosen with 3 blemished tires in $^{1000}C_3 \times {4000}C_7$ ways.

Possibility 2: <u>2 tires are blemished.</u>

Total 10 tires can be chosen with 2 blemished tires in $^{1000}C_2 \times ^{4000}C_8$ ways.

Possibility 3: <u>1 tires are blemished.</u>

Total 10 tires can be chosen with 1 blemished tires in $^{1000}C_1 \times^{4000}C_9$ ways.

Possibility 4: <u>No tires are blemished.</u>

Total 10 tires can be chosen with no blemished tires in $^{1000}C_0 \times^{4000}C_{10}$ ways.

Hence, the required probability is $\frac{^{1000}C_1 \times^{4000}C_9 + ^{1000}C_0 \times^{4000}C_{10} + ^{1000}C_2 \times^{4000}C_8 + ^{1000}C_3 \times^{4000}C_7}{^{5000}C_{10} }$ .

6 0

3 years ago

Could you tell me the answer about this?

wolverine [178]

Answer:

x is 70°

Step-by-step explanation:

80 + 55= 135

180-135 = 45

45 +45 =90

180-90=90

80+80= 160

180-160= 20

20 +90= 110

180-110 = 70

x is 70

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2 years ago

It’s the end of the accounting period, and no electric bill has been received (but the expense has been incurred); you should re

san4es73 [151]

<span>C. increases the total liabilities and increases the total expenses. </span>

4 0

3 years ago

Read 2 more answers

If edge of cube is reduced by 25%.find the percentage decrease in its total surface area.​

If edge of cube is reduced by 25%.find the percentage decrease in its total surface area.