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4 years ago

PLEASEEEE ANSWER ASAP

Mathematics

1 answer:

Alona [7]4 years ago

3 0

Answer:

x = -1, x = 1

Step-by-step explanation:

Factor the equation. (It's a difference of squares, so we know the form will be (a-b)(a+b).)

$y = x^{2} - 1\\y = (x-1)(x+1)$

Test this by FOILing it out, if you're unsure. This is something it can be good to memorize!

Set it equal to 0.

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

Separate the two parenthetical expressions by the Zero Product Property.

$0 = x+1\\0 = x-1$

Solve for x!

$x=-1, x=1$

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What is the probability of spinning a odd number, flipping heads, then spinning a 3?

aalyn [17]

Answer:

Probability of spinning a odd number is 5/9

I don't know about flipping head

Probability of spinning a 3 is 1/9

6 0

3 years ago

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How many terms are in the arithmetic sequence 5, 1, −3, . . . , −111?

masya89 [10]

Here, it helps to find a general expression for the nth term in the sequence. Since the sequence is arithmetic, the general term is a_n = a + bn, where b is the common difference. By inspection of the first few terms we see the common difference is -4. Then by solving a_1 = a - 4x1 = 5, we obtain a = 9, so the nth term is: a_n = 9-4n. We then solve a_n=-111 for n, so 9-4n=-111. Rearranging, we get 4n=9+111, or 4n=120, or n=30. Thus there are 30 terms in the sequence.

6 0

4 years ago

Helpppp I will give BRAINLY just please help

MAXImum [283]

Answer:

$\Huge\boxed{x=12}$

Step-by-step explanation:

Hello There!

The following angles are complementary angles

Complementary angles have a sum of 90

So to solve for the variable (x) we use this equation

90 = 35 + 4x + 7

step 1 combine like terms

35+7=42

now we have

90 = 4x + 42

step 2 subtract 42 from each side

90 - 42 = 48

42 - 42 cancels out

now we have

48 = 4x

step 3 divide each side by 4

4x/4 = x

48 / 4 = 12

we're left with x=12

5 0

3 years ago

1. Suzette ran and biked for a total of 60 mi in 6 h. Her average running speed was 4 mph and her average biking speed was 12 mp

evablogger [386]

Suzette ran for 1.5 hours and biked for 4.5 hours

Step-by-step explanation:

The given is:

Suzette ran and biked for a total of 60 miles in 6 hours
Her average running speed was 4 mph
Her average biking speed was 12 mph
Let x = total hours Suzette ran
Let y = total hours Suzette biked

∵ x represents the total hours Suzette ran

∵ y represents the total hours Suzette biked

∵ Suzette ran and biked for a total 6 hours

∴ x + y = 6 ⇒ (1)

∵ Her average running speed was 4 mph

∵ Her average biking speed was 12 mph

∵ Distance = speed × time

∴ Her total distance = 4 x + 12 y

∵ Suzette ran and biked for a total of 60 miles

- Equate the two expressions of her total distance

∴ 4 x + 12 y = 60 ⇒ (2)

Now let us solve the system of equations to find the values of x and y

Multiply equation (1) by -4 to eliminate x

∵ (-4) x + (-4) y = (-4)(6)

∴ -4 x - 4 y = -24 ⇒ (3)

- Add equations (2) and (3)

∴ 8 y = 36

- Divide both sides by 8

∴ y = 4.5

∴ Suzette biked for 4.5 hours

- Substitute the value of y in equation (1) to find the value of x

∵ x + 4.5 = 6

- Subtract 4.5 from both sides

∴ x = 1.5

∴ Suzette ran for 1.5 hours

Suzette ran for 1.5 hours and biked for 4.5 hours

Learn more:

You can learn more about system of equations in brainly.com/question/6075514

#LearnwithBrainly

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3 years ago

Nick has $15 to spend at the school store. Notebooks are $2 each and jolly ranchers are $3 per bag. If nick buys 2 bags of jolly

choli [55]

Answer:

Step-by-step explanation:

he has 15$

3 jolly ranchers bags is 9$

so 9-15 is 6

u can buy 3 notebooks

8 0

3 years ago

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