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kumpel [21]
4 years ago
6

Solve

ass="latex-formula"> algebraically
Mathematics
1 answer:
Brums [2.3K]4 years ago
7 0

Answer:

x=9   x=-1

Step-by-step explanation:

We can factor

x^2 -8x-9 =0

What 2 numbers multiply to -9 and add to -8

-9*1 = -9

-9 +1 = -8

(x-9) (x+1) =0

Using the zero product property

x-9 =0   x+1 =0

x=9   x=-1

You might be interested in
The price of a pair of jeans is $30. The original price of the jeans was $45. What was the percent discount?​
Juliette [100K]

Answer:

33% discount

Step-by-step explanation:

15$ is the amount that was taken off so now we just need to convert it to a % of 45

45/100 = 30/?

if you do cross multiplication and multiply 30 * 100 then divide the result (3000) by 45 you get 66

This means that 30$ is 66% of 45. To find the discount you just subtract 66% (this represents your 30$ new price) from 100% (this represents the 45% original price) and you get 33%.

6 0
3 years ago
A ___________is a group of places with shared physical or human characteristics.
Vera_Pavlovna [14]
The answer would be region because they interact an share physical an human characteristics
4 0
4 years ago
Use a diagram to solve: Sara ran two-fifths of the race. She needs to run 120 m more to finish the race. What is the length of t
KATRIN_1 [288]
The answer would be 200 meters.
7 0
3 years ago
In a geometric sequence, a2= -144 and a5=486. Write the explicit formula for this sequence
pickupchik [31]

Answer:

a_{n} = 96(-1.5)^{n-1}

Step-by-step explanation:

The n th term of a geometric sequence is

a_{n} = a(r)^{n-1}

where a is the first term and r the common ratio.

Both values have to be found.

Using

a₂ = - 144, then

ar = - 144 → (1)

a₅ = 486, then

ar^{4} = 486 → (2)

Divide (2) by (1)

\frac{ar^4}{ar} = \frac{486}{-144}

r³ = - 3.375 ( take the cube root of both sides )

r = - 1.5

Substitute r = - 1.5 into (1)

- 1.5a = - 144 ( divide both sides by - 1.5 )

a = 96

Hence explicit formula is

a_{n} = 96(-1.5)^{n-1}

5 0
4 years ago
Please help!! It’s for homework.
motikmotik

Answer:

t = cost of a ticket

4t+55

Step-by-step explanation:

Cost 1

4 airline tickets

Let t = cost of a ticket

4*t

Cost 2

extra baggage fee

55

Add the costs together

4t+55

8 0
3 years ago
Read 2 more answers
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