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3 years ago

What is the surface area of a sphere with a radius of 7 feet? (use 3.14 for pie)

Mathematics

1 answer:

scoundrel [369]3 years ago

3 0

The surface area of the sphere is 6,770 sq.ft

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There are 15 copies of a popular cd left to be sold in the store this is between 1% and 1.5% of the original number of copies of

Triss [41]

Answer: The original number of CDs is between 1000 and 1500.

Step-by-step explanation:

Since we have given that

Number of copies of a popular CD left to be sold in the store = 15

According to question, this is between 15 and 1.5% of the original number of copies of the CD in the store.

Let the original number of copies of the CD in the store be 'x'.

Now, 15 is equal to 1% of the original number of copies of the CD, it becomes

$1\%\ of\ x=15\\\\\frac{1}{100}\times x=15\\\\x=15\times 100\\\\x=1500$

Or if 15 is equal to 1.5% of the original number of copies of the CD, it becomes

$1.5\%\ of\ x=15\\\\\frac{1.5}{100}\times x=15\\\\\frac{15}{1000}x=15\\\\x=\frac{15\times 1000}{15}\\\\x=1000$

Hence, the original number of CDs is between 1000 and 1500.

3 0

3 years ago

A fish tank is three-fourths full.

max2010maxim [7]

Answer: $\frac{5}{12}$

Step-by-step explanation:

We will subtract the amount of water that leaked out from the amount of water originally in the fish tank.

$\displaystyle \frac{3}{4} - \frac{1}{3} =\frac{3*3}{4*3} -\frac{1*4}{3*4} =\frac{9}{12} -\frac{4}{12}=\frac{5}{12}$

The fish tank is $\frac{5}{12}$ of the way full.

6 0

1 year ago

Triple a number decreased by 14

Ira Lisetskai [31]

Since we know 14, but we don't know the other number, we use a variable. To do that, we look at the problem, then we figure out the unknown. The unknown is: A number. We know 14. Since "Triple" means 3, we can put the exponent 3 by X.

Therefore, the answer is $X^3-14$ .

3 0

3 years ago

Find the perimeter of triangle ABC. Approximate to the nearest whole unit.

kolbaska11 [484]

Answer: 16 units

Step-by-step explanation: adding the perimeter sides to get the perimeter of triangle ABC would be 4.1+6.1+5.8 = 16

7 0

2 years ago

Read 2 more answers

D=h+9 The variable H represents the number of hours worked, and the variable d represents the amount of dough prepared how many

Marta_Voda [28]

Answer:

12 hours

Step-by-step explanation:

If we assume that the units of D are kg, then we can put the given number into the equation and solve.

21 = h +9

12 = h . . . . . subtract 9

Eli worked 12 hours to prepare 21 kg of dough.

8 0

3 years ago