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liberstina [14]
4 years ago
15

Find the value of this expression if x = 9. X^2-9 / x-7

Mathematics
1 answer:
babunello [35]4 years ago
8 0

Answer:

36

Step-by-step explanation:

Given

\frac{x^2-9}{x-7} substitute x = 9 into the expression

= \frac{9^2-9}{9-7}

= \frac{81-9}{2}

= \frac{72}{2}

= 36

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1. Solve. 3(h – 4) = –1/2(24 – 6h)<br><br> 2. Solve for x. ax + bx = –c
Naddik [55]
ANSWER TO QUESTION 1

3(h-4) = - \frac{1}{2} (24 - 6h)

We multiply through by the Least Common Multiple which is 2.

2 \times 3(h-4) = - 2 \times \frac{1}{2} (24 - 6h)

6(h - 4) = - 1(24 - 6h)

We expand brackets to obtain,

6h - 24 = - 24 + 6h

Grouping like terms, have

6h - 6h = - 24 + 24

\Rightarrow 0 = 0

Whenever you solve an equation and you get the above result, you don't have to get confuse.

It simply means the question does not have a UNIQUE solution.

That any real number will number will satisfy the above equation.

Hence,

h \in R




ANSWER TO QUESTION 2

ax + bx = - c

We factor x to obtain;

x(a + b) = - c

We divide both sides by (a+b)

x = - \frac{ c}{a + b}
3 0
3 years ago
I need answers ASAP<br>​
AURORKA [14]

Answer:

Simplifying

6r + r + -5r = 0

Combine like terms: 6r + r = 7r

7r + -5r = 0

Combine like terms: 7r + -5r = 2r

2r = 0

Solving

2r = 0

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Divide each side by '2'.

r = 0

Simplifying

r = 0

8 0
3 years ago
Read 2 more answers
chelsea has four hours of free time on saturday. she would like to spend no more than 2/3 of an hour on each activity. how many
shutvik [7]
4 / (2/3) =
4 * 3/2 =
12/2 =
6 activities

OR

2/3(60) = 120/3 = 40 minutes per activity
40 hrs = (60 x 40) = 240 minutes
240/40 = 6 activities
4 0
3 years ago
What is 1/2 divided by 1/6
Phoenix [80]

Answer:

3

Step-by-step explanation:

Dividing two fractions is the same as multiplying the first fraction by the reciprocal (inverse) of the second fraction.

Take the reciprocal of the second fraction by flipping the numerator and denominator and changing the operation to multiplication.

For fraction multiplication, multiply the numerators and then multiply the denominators.

Since 6 divided by 2 equals 3, 3 is the answer.

6 0
4 years ago
What is α, the probability of a Type I error if the null hypothesis, H0, is: Carmin believes that her chemistry exam will only c
baherus [9]

Answer:

The probability of falling into a type I error, when testing a hypothesis test, consists of:

Probability of rejecting the null hypothesis when, in reality, this hypothesis is true.

Probability of rejecting the null hypothesis when, in reality, this hypothesis is true, is:

Probability of Affirm that Chemistry exam will NOT cover only chapters four and five, since the Chemistry exam will cover only chapters four and five.

That is, alpha is the probability that Carmin decides to study additional chapters, unnecessarily.

Step-by-step explanation:

8 0
3 years ago
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