Mathematics College

Can someone help me with this?

Answers

Answer 1

Answer:

Choice A: 11

Step-by-step explanation:

We have x² - y² = 19

x² - y² = (x + y)(x-y)

So (x + y)(x-y) = 19

Since x and y are integers as per the first statement (x, y ∈ Z), we also have x + y = integer and x-y = integer

Take (x + y)(x - y) = 19

Since 19 is prime its only factors are 1 and 19

So we have two situations which can satisfy the above
Either x + y = 1 and x -y 19 or x + y = 19 and x -y = 1

1. Let's try x + y = 1 and x - y = 19
Adding both equations together gives us 2x = 20 (y-terms cancel)

==> x = 10 ==> 10 + y = 1 or y = -9

So 2x - 9 => 2(10) - (-9) = 20 + 9 = 29

This is not one of the choices so we can go on to the next case

2 Let's take x + y = 19 and x - y = 1

Adding these two equations gives us
2x = 20, x = 10 as before

Use 10 in the equation x + y = 19

==> 10 + y = 19

==> y = 19 - 10 = 9

2x - y ==> 2(10) - 9 ==> 20 - 9 = 11

So answer is choice A: 11

Related Questions

< Question 7, 1.5.25 >
The line graph to the right indicates that in 1960, 21% of taxes came from corporate income tax. For the period from 1960 through 2010,
this percentage decreased by approximately 0.32 each year. If this trend continues, by which year will corporations pay zero taxes?

Answers

The 21% of taxes and annual percentage decrease of 0.32, using arithmetic progression gives;

The year corporations will pay zero taxes as 2025

How can arithmetic progression be used to find the required year?

The percentage of tax that comes from corporate income tax = 21%

Amount by which the percentage decreased each year = 0.32

Period during which the tax reduced = Between 1960 and 2010

Required;

The year corporations pay zero taxes.

Solution;

The amount of tax paid each year can be given by the arithmetic progression formula,

[tex] a_{n} = a + (n - 1) \cdot d[/tex]

Where;

a = The first term = 21

[tex] a_{n} = value \: on \: the \: nth \: year[/tex]

d = The common difference = -0.32

When [tex] a_{n} = 0 [/tex], we have;

[tex] 0 = 21 + (n - 1) \times (-0.32) [/tex]

0.32•(n - 1) = 21

n - 1 = 21/0.32 = 65.625

n = 65.625 - 1 = 64.625 ≈ 65

The year the corporations will pay no taxes is 1960 + 65 = 2025

Corporations will pay no taxes in the year 2025

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PLEASE HELP FAST I ONLY HAVE ONE HOUR!!!!!!!

Answers

The proportion of users that park bike on the trail is 0.1728

How to determine the proportion of users that park bike on the trail?

The table represents the given parameters

From the table, we have the following parameters

Suburban total = 243

Users that park bike on the trail = 42

The proportion of users that park bike on the trail is then calculated as

P = Users that park bike on the trail/Suburban total

This gives

P = 42/243

Evaluate

P = 0.1728

Hence, the proportion of users that park bike on the trail is 0.1728

Answers

The quadratic equation that passes through points (1, - 9) and (0, - 8) is y = x² - 2 · x - 8.

What is the quadratic equation that passes through two points?

Graphically speaking, quadratic equations are parabolas. The quadratic equation in vertex form is described by this formula:

y - k = C · (x - h)²

Where:

(h, k) - Vertex of the parabola.C - Vertex constant.

If we know that (x, y) = (0, - 8) and (h, k) = (1, - 9), then the vertex constant is:

- 8 + 9 = C · (0 - 1)²

1 = C · (- 1)²

1 = C

C = 1

Then, the quadratic equation in vertex form is:

y + 9 = (x - 1)²

Whose standard form is:

y + 9 = x² - 2 · x + 1

y = x² - 2 · x - 8

The quadratic equation that passes through points (1, - 9) and (0, - 8) is y = x² - 2 · x - 8.

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Suppose you are heading to the
beach with a friend. The beach is 80
miles from your house and the drive
takes about 1 hour and 30 minutes.
Your friend's house is 64 miles from
the beach. Use direct variation to
determine how long it will take to
drive to the beach if you leave from
your friend's house.

Answers

The time it would take to drive to the beach if you leave from the friend's house is 1 hour 12 minutes

Calculating time

From the question, we are to calculate how long it would take to drive to the beach if you leave from your friend's house

From the given information,

The beach is 80 miles from your house and the drive takes about 1 hour 30 minutes

Distance, d, varies directly with time, t.

d ∝ t

d = vt

Where v is the proportionality constant.

Now, we will find v

d = 80 miles

t = 1.5 hours = 3/2 hours

Thus,

80 = (3/2)v

v = (2 × 80)/3

v = 160/3 miles/hour

Now, we will determine t when d is 64 miles

d = vt

64 = 160/3 × t

t = (64 × 3)/160

t = 192/160 hours

t = 6/5 hours

t = 1 hour 12 minutes

Hence, the time it would take to drive to the beach if you leave from the friend's house is 1 hour 12 minutes

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help me with this precal

Answers

Answer: Ok

Step-by-step explanation:

9-0-0

Wilson hires a financial analyst to analyse costs and profits for his cereal production business. The analyst determines that Wilson’s eventual profit function is given as: , where x is the number of bags of cereal produced. At what point or number of bags of cereal will Wilson’s profit start decreasing

Answers

The company's profit will start to decline if it only produces one bag.

Given f(x) = 2x⁴ ₋ 4x³ ₊ 7

Differentiate it with respect to x.

therefore, f'x) = 8x³ ₋ 12x²

= 4x²(2x ₋ 3)

For decreasing, f'(x) ≤ 0

⇒ 4x²(2x ₋ 3) ≤ 0

⇒ 2x ₋ 3 ≤ 0

⇒ x ≤ 3/2

Since the number of bags are represented by x.

Hence, x ∈ N

Therefore, x = 1 is only possibility.

Therefore, if the company only produces one bag, its profit begins to decline.

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Your question was incomplete. Please find the missing the content here.

Wilson hires a financial analyst to analyse costs and profits for his cereal production business. The analyst determines that Wilson's eventual profit function is given as: pi = 2x⁴ ₋ 4x³ ₊ 7 where x is the number of bags of cereal produced. At what point or number of bags of cereal will Wilson's profit start decreasing?

Brock, age 50, and Erin, age 49, are married with three dependent children. They file a joint return for 2021. Their income from salaries totals $50,000, and they received $8,000 in taxable interest, $5,000 in royalties, and $3,000 in other ordinary income. Brock and Erin's deductions for adjusted gross income amount to $2,500, and they have itemized deductions totaling $19,250.

Answers

Based on the filing status of Brock and Erin, their itemized deductions, and their income from their salaries, their income tax liability is $4,250.

What is the income tax liability?

First, find the taxable income:

= Adjusted gross income - larger of Itemized deductions or standard deductions

= (50,000 + 8,000 + 5,000 + 3,000 - 2,500) - 24,800

= $38,700

The tax rate is 10 % for income between $0 and $19,750 and 12% for salaries between $19,751 and $80,250.

Brock and Erin therefore have a tax liability of:

= (10% x 19,750) + (12% x (38,700 - 19,750))

= $4,252

Rest of the question is:

Find the Income tax liability before any credits

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PLSSS HELP ANSWER, THE QUESTION IS IN THE SCREENSHOT

Answers

[tex]y(\pi/3)=1 \implies 1=C-2\cos(\pi/3) \\ \\ 1=C-1 \\ \\ C=0 \\ \\ \therefore y=\boxed{-2\cos x}[/tex]

High divers use the height of the diving platform to calculate the speed at which they enter the
water. The formula 58-34-12 models the diver's speed s (in miles per hour) and the height
h (in feet) of the platform.
a. Solve the formula for 3 and for h
b. At what speed does a diver enter the water when the platform is 82 feet tall?
c. A diver enters the water at 48 miles per hour. How tall is the platform?

Answers

a. 3h = -12 + 5s

b. Speed = 51. 6 miles per hour

c. Height = 76 feet

How to determine the value

Given the function;

5s - 3h = 12

Where;

s is the speed in miles per hourh is the height in feet

a. To solve for 3h

We have;

- 3h = 12 - 5s

3h = -12 + 5s

b. If the height is 82 feet , then

5s - 3(82) = 12

5s - 246 = 12

collect like terms

5s = 12 + 246

5s = 258

Make 's' the subject

s = 258/ 5

s = 51. 6 miles per hour

c. If the speed is 48 miles per hour, we have;

5(48) - 3h = 12

240 - 3h = 12

collect like terms

-3h = 12 - 240

-3h = -228

Make 'h' the subject

h = -228/ -3

h = 76 feet

Thus, the speed and height are 51. 6 miles per hour and 76 feet respectively.

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Triangle XYZ has translated 4 units up and 3 units left to yield ΔX'Y'Z'. What is the distance between any two corresponding points on ΔXYZ and ΔX'Y'Z′?

Answers

The distance between any two point is 5 unit.

What is distance?

The measurement of distance between two objects or points can be quantitative or occasionally qualitative. Distance in physics or common language can refer to a physical length or an assumption based on other factors.

As per the question

Triangle xyz is translated = 4units

And triangle xyz left to yield=3 unit

The distance between the corresponding is hypotenuse of the triangle is-

Buy applying Pythagorus theorem we can get C^2=a^2+b^2

As we know a,b=legs

c=hypotenus

C^2=a^2+b^2C^2

=3^2+4^2

=9+16

=25C =√25 =5 unit