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3 years ago

Please help asap i keep failing these quizzes i’m so confused

Mathematics

2 answers:

daser333 [38]3 years ago

8 0

Answer:

try b

Step-by-step explanation:

Alexeev081 [22]3 years ago

8 0

Answer:

Step-by-step explanation:

Negative times a Negative is a Positive

Positive times Negative is a Negative

Positive times a Positive is a Positive

You might be interested in

Simplify the expression (5-5i)-(-6-3i)

cupoosta [38]

Answer: Simplifying the expression of the substraction of the two complex numbers we get 11-2i

Solution:

(5-5i)-(-6-3i)

Eliminating the parentheses: 5-5i+6+3i

Grouping similar terms: (5+6)+(-5+3)i

Adding the similar terms: 11+(-2)i = 11-2i

7 0

3 years ago

Read 2 more answers

The equation d=11cos(8pi/5 t) models the horizontal distance, d, in inches of the pendulum of a grandfather clock from the cente

charle [14.2K]

Answer:

The time it takes for the pendulum to swing from its rightmost position to its leftmost position and back again is 1.25 seconds.

Step-by-step explanation:

Given the equation

$d = 11cos( \frac{8\pi}{5}*t)$ -----------Equation 1

where d, in inches of the pendulum of a grandfather clock from the center.

Comparing with the standard equation of an oscillating pendulum bob.

$d = Acos (wt + \alpha )$ ----------Equation 2

where ω = angular velocity

t = time taken

α = The angular displacement when t = 0

Comparing equation 1 and 2,

α = 0

$w =\frac{8\pi }{5}$

Recall that $w = 2\pi fTherefore,[tex]2\pi f = \frac{8\pi }{5} \\\\f = \frac{4}{5}$ [/tex]

f = 0.8 Hertz

Recall that $f = \frac{1}{T}$

$T = \frac{1}{0.8}$

T = 1.25 seconds

Therefore, the time it takes for the pendulum to swing from its rightmost position to its leftmost position and back again is 1.25 seconds.

5 0

3 years ago

Read 2 more answers

Which polynomial is prime?

finlep [7]

we know that

If the only factors a polynomial are $1$ and itself, then that polynomial is prime.

If the polynomial has at least one root (one x-intercept) then the polynomial is not prime

Using a graph tool

case 1)

$x^{3}+ 3x^{2} + 2x+ 6$

see the attached figure N 1

The polynomial has one root-------> the polynomial is not prime

case 2)

$x^{3} + 3x^{2} - 2x - 6$

see the attached figure N 2

The polynomial has three roots-------> the polynomial is not prime

case 3)

$10x^{2}-4x+3x + 6$

$10x^{2} -x + 6$

see the attached figure N 3

The polynomial has zero roots-------> the polynomial is prime

case 4)

$10x^{2}-10x+6x - 6$

$10x^{2} -4x - 6$

see the attached figure N 4

The polynomial has two roots-------> the polynomial is not prime

therefore

the answer is

$10x^{2}-4x+3x + 6$ ------> is prime

8 0

3 years ago

Read 2 more answers

An employee earns a gross pay of $1,200.00 per week. The employee's net pay is $850.00. The employee's voluntary 401(k) contribu

Yuliya22 [10]

Answer:

$300 was deducted from tax. The tax rate is 26.1%

Step-by-step explanation:

An employee earns a gross pay of $1,200.00 per week. The employee’s net pay is $850.00. The employee’s voluntary 401(k) contribution is $50.00 per month.

There was blank deducted for taxes. The tax rate is blank

Solution:

Contributions that are made for retirement such as 401(k) contribution plans are made on a pretax basis. This means that they are removed from your taxable income, thereby reducing the tax.

Gross pay = $1200

Taxable income = Gross pay - 401(k) contribution

Taxable income = $1200 - $50 = $1150

Net pay = $850

Tax = Taxable income - Net pay

Tax = $1150 - $850

Tax = $300

Tax rate = (Tax / taxable income) * 100%

Tax rate = ($300 / $1150) * 100% = 26.1%

3 0

3 years ago

Tina works for a medical technology company in sales. She travels to doctors' offices and offers them a suite of software relate

sesenic [268]

Answer: b. 1.94

Step-by-step explanation:

For binomial distribution model , the formula to find standard deviation is given by :-

$\sigma=\sqrt{np(1-p)}$

Given : The portability that the offices she visits will eventually purchase her product: p=0.25

The number of offices she visited = 20

We assume that the binomial is an appropriate model for the number of offices that make a purchase.

Then, to find the distance of the possible number of sales Tina could observe from the overall mean number of sales we find standard deviation.

$\sigma=\sqrt{np(1-p)}\\\\=\sqrt{20(0.25)(0.75)}\\\\=\sqrt{3.75}=1.9364916731\approx1.94$

Hence, the correct answer is option (b).

5 0

3 years ago