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3 years ago

X^2-9 factor this problem plz

Mathematics

1 answer:

lara31 [8.8K]3 years ago

5 0

Answer:

(x-3)(x+3)

Step-by-step explanation:

that's what it factors to

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an item on sale costs 60% of the original price. If the original price. If the original price was $40, what is the sale price?

DanielleElmas [232]

Answer: $24

Step-by-step explanation:

40 * .60 = $24

4 0

3 years ago

A grocer mixed walnuts worth $1.02 per pound with peanuts worth $0.99 per pound. If she made 69 pounds of a mixture worth $1 per

Nataly [62]

The cost of the mixture is $69 *$1 = $69. If all 69 pounds were peanuts, the cost would be 69*$0.99 = $68.31, which is $0.69 less. Each pound of walnuts used instead of peanuts adds $0.03 to the cost of the mixture, so there were $0.69/$0.03 = 23 pounds of walnuts.
_____ 
Let w represent the number of pounds of walnuts in the mixture. Then 69-w is the number of pounds of peanuts. The cost of the mixture will be 
1.02w + 0.99(69-w) = 1.00*69 dollars 
0.03w + 68.31 = 69.00 
w = (69.00 - 68.31)/0.03 = 0.69/0.03 = 23

6 0

3 years ago

A student used f(x)=5.00(1.012)xf(x)=5.00(1.012)x to show how the balance in a savings account will increase over time. What doe

taurus [48]

Answer:

5.00 is the value of the initial balance (i.e. when time is 0) in the savings account.

Step-by-step explanation:

We have the function, $f(x)=5.00(1.012}^x$ which represents the balance in the savings account.

Now, if we substitute x= 0, we have,

$f(x)=5.00(1.012}^x$ implies $f(0)=5.00(1.012}^0$

As, 'any number with power 0 is equal to 1 i.e. $x^0=1$ '.

We get,

$f(0)=5.00(1.012}^0$ implies $f(0)=5.00\times 1$ i.e. f(0)= 5.00

Thus, we see that,

5.00 is the value of the initial balance (i.e. when time is 0) in the savings account.

5 0

3 years ago

A cell phone company says that a fully charged battery lasts 14 hours. In reality, each battery behaves a little differently. Fo

gregori [183]

Answer:

The percentage is 50%

Step-by-step explanation:

From the question we are told that

The mean is $\mu = 14 \ hours$

The standard deviation is $\sigma = 1 \ hour$

Generally on the normal distribution curve the mean divides the curve into two. with the half to the left of the mean (50% to the left )representing the percentage of the batteries that will last less than 14 hours and the area under the curve to the right (50% to the right)representing the percentage of batteries that will last longer than mean (14 hours )

Hence the percentage of the cell phone batteries that will be expected to last longer than 14 hours is 50%

8 0

4 years ago

What is the solution to 3.2x = 6.4?

jeyben [28]

A. X = 2
what you do is divide each side by the coefficient of x (3.2) to get rid of it on the left, and simplify the right: 2.

6 0

4 years ago