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3 years ago

What are the two solutions to this equation? x^2−4x−8=0

Mathematics

1 answer:

77julia77 [94]3 years ago

5 0

your answer is wait hang on ive got this let me right it down

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Check my answers, please.

Artyom0805 [142]

You have all five questions correct. Nice work

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Problem 1: There are 8 spaces labeled 1 though 8 so the proper sample space is {1,2,3,4,5,6,7,8} which is basically all the possible outcomes

Problem 2: There is one "3" out of 8 total, so 1/8 is the probability of landing on 3

Problem 3: There are 4 spaces that are even {2,4,6,8} out of 8 total {1,2,3,4,5,6,7,8}. So 4/8 = 1/2

Problem 4: There are 4 blue out of 3+5+4 = 12 total, so 4/12 = 1/3

Problem 5: We got 24 red out of 40 total, so 24/40 = 3/5

6 0

4 years ago

Find one value of x for F(x)=-4

Evgesh-ka [11]

F(x) = -4 means y = -4. That means whatever the x is, the answer is going to be -4.

8 0

3 years ago

You invested $20,000 in two accounts paying 7% and 8% annual interest, respectively. If the total interest earned for the year

sasho [114]

Answer:

$7,000 at 7%; $13,000 at 8%

Step-by-step explanation

x: the amount invested at 7%

y: the amount invested at 8%

x + y = 20,000

7%.x + 8%.y = 1,530

⇒ x =7,000

y = 13,000

5 0

3 years ago

Please find the x for these

sweet [91]

Answer:

x=b-8a/8

x=b+8a/a

x=2-2c/c

8 0

3 years ago

A concrete driveway is 5 feet longer than twice its width. It has a brick walkway 3 feet wide on the front and side of the drive

KonstantinChe [14]

Answer:

The dimensions of the driveway are 21 ft x 47 ft, which is option "D" in your list of possible answers

Step-by-step explanation:

Notice that the length "L" of the driveway can be written in terms of its width as:

L = 2 w + 5

based on the given information.

Please see the attached diagram to understand the geometry of the problem, and what the area of the brick walkway involves (depicted in brick color) as the addition of the area of two rectangles:

1) one of length L= 2 w + 5 (w being the width of the driveway - depicted in grey) times 3 feet (the width of the brick walkway

and the other one:

2) w + 3 times 3

Therefore the total area of the brick walkway is given by the formula:

(2 w + 5) * 3 +(w + 3) * 3 = 213 square feet

Now we can solve for "w" in the above equation:

6 w + 15 + 3 w + 9 = 213

9 w + 24 = 213

9 w = 213 - 24

9 w = 189

w = 189/9

w = 21 feet

We can now solve for the L of the driveway, using the first formula we created:

L = 2 w + 5

L = 2 (21) + 5

L = 42 + 5

L = 47 feet

Therefore the driveway's width is w = 21 feet

and its length is L = 47 feet

7 0

3 years ago