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Juli2301 [7.4K]
3 years ago
13

(9b−1)(9b+1) Me pueden ayudarme con esta otra pregunta Please.

Mathematics
1 answer:
mrs_skeptik [129]3 years ago
8 0

Answer:

Using identify (a+b)(a-b) =a²-b²

Ur answer is (9b-1)(9b+1) =81b²-1

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$10,000 is compounded semiannually at 12% interest for t years. what expression represents the amount of money after t years?
kari74 [83]
To solve this, you can do the is over of equals to % over hundred.
is         %
__ = ____
of      100
10,000      12
_____ = ____
    t           100
1,000,000=12t
                __    
t=83,333.33
i hope this helps!
3 0
3 years ago
Help me out please?
iren2701 [21]
No thx have a great day
7 0
3 years ago
Assume there are 100 million passenger cars in the. United States and that the average fuel consumption is. 20 mi/gal of gasolin
Anastasy [175]
10,000 miles : 20 mi/gal = 500 gal
10,000 miles : 25 mi/gal = 400 gal
500 - 400 = 100 gal ( saved per year )
100 x 100,000,000 = 10,000,000,000
Answer: 10 billion gallons of fuel would be saved if the average fuel consumption mi/gal was increased to 25. 

4 0
4 years ago
Jasmine borrowed $15,000 for 8 years and she paid $6,600 in interest. What was the interest rate for Jasmine's loan?
weeeeeb [17]

Answer:

5.5%

Step-by-step explanation:

To find the interest rate, use the equation:  I = prt

I = Interest = $6,600

p = principal = $15,000

r = rate = unknown

t = time = 8 years


Now plug the numbers into the equation.

6,600 = 15,000 * r * 8

6,600 = 120,000 * r


Now isolate the variable by dividing both sides of the equation by 120,000.

0.055 = r


Now change the rate to a percent by moving the decimal point 2 digits to the right.

5.5% = r   OR   r = 5.5%

4 0
3 years ago
The average thickness of a chicken eggshell is 0.000356 m. Write an estimate for the average thickness of a chicken eggshell as
Alekssandra [29.7K]

The average thickness of a chicken eggshell being 0.000356 m is written as a single digit times an integer power of 10 as: 4 × 10^{-4} (approx)

<h3>How does scientific notations work?</h3>

The number is written in the form  a \times 10^b where we have 1 \leq a < 10

The number b shows the order, which is the most important figure for which scientific notation is used. It tells us how much order large or small a value is in powers of 10. We can for a time, ignore the value of 'a' for two comparable quantities and only compare their orders(this type of comparison is useful when difference is too big, like size of human to size of a star etc sort of comparisons).

Scientific notations have some of the profits as:

Better readability due to compact representation

Its value in terms of power of 10 is known, which helps in easy comparison of quantities differing by a large value.

We're given that:

Average thickness of a chicken eggshell = 0.000356 m

We can rewrite it as:

0.000356 = \dfrac{356}{1000000} = \dfrac{3.56}{10000}= \dfrac{3.56}{10^4} = 3.56 \times 10^{-4}

Since we need to write it as a single digit times an integer power of 10, therefore, we get:
3.56 \times 10^{-4} \approx 4 \times 10^{-4}

Thus, the average thickness of a chicken eggshell being 0.000356 m is written as a single digit times an integer power of 10 as: 4 × 10^{-4} (approx)

Learn more about scientific notation here:

brainly.com/question/3112062

#SPJ1

5 0
2 years ago
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