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3 years ago

Solve the equation by completing the square. Round to the nearest hundredth if necessary. x2 – x – 7 = 0

2 answers:

8 0

2x-x-7=0

3x-7=0

add 7 to 7 and 0, so then we cross out 7-7, and then

3x=7, bc u change the subtraction to addition, sr if thst doesn't make sense but 3x=7 is the answer

DiKsa [7]3 years ago

4 0

X^2 - x - 7 = 0
x^2 - x = 7
x^2 - x + 0.25 = 7 + 0.25
(x - 0.5)^2 = 7.25
x - 0.5 = (+ - ) sqrt 7.25
x = 0.5 (+-) 2.69

x = 0.5 + 2.69 = 3.19 <==
x = 0.5 - 2.69 = -2.19 <==

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g100num [7]

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3 years ago

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padilas [110]

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4 0

3 years ago

If the typical balance on Lucy's credit card is $650 and the interest rate (APR) on her credit card is 18%, how much in interest

Mariana [72]

$9.75

<h3>Further explanation </h3>

Given:

The typical balance on Lucy's credit card is $650.
The interest rate (APR) on her credit card is 18%.

Question:

How much in interest would you expect Lucy to be charged in a typical month?

The Process:

This problem includes the type of determining simple interest.

$\boxed{ \ I = P \times r \times t \ }$

where,

I = simple interest
P = principal (initial amount)
r = annual interest rate
t = time (in years)

This time we will find out how much in interest we would expect to be charged in a typical month.

The data is as follows:

P = 650
r = 18% or $\frac{18}{100}$ or 0.18
t = $\frac{1}{12}$ year (one month)

Let us calculate how much in interest we would expect to be charged in a typical month.

$\boxed{ \ = 650 \times \frac{18}{100} \times \frac{1}{12} \ }$

$\boxed{ \ = 65 \times \frac{3}{10} \times \frac{1}{2} \ }$

$\boxed{ \ = \frac{195}{10} \times \frac{1}{2} \ }$

$\boxed{ \ = \frac{97.5}{10} \ }$

$\boxed{ \ = \frac{975}{100} \ }$

Thus the amount of interest we would expect Lucy to be charged in a typical month is $ 9.75.

_ _ _ _ _ _ _ _ _ _

Notes

We must be able to distinguish between simple and compound interest. Please learn about this in the link attached below.

<h3>Learn more </h3>

What interest (in dollars) does he receive annually? brainly.com/question/8192969
How much will our account accrue to in 9.5 years brainly.com/question/4127036
What is the total amount owed at the end of the 4 years brainly.com/question/13675435

4 0

3 years ago

Read 2 more answers

If y=3x^3-2x and (dx)/(dy) = 3, find (dy)/(dt) when x=-2

lesya692 [45]

Answer:

dy/dx = 9x²+2

dy = (9x²+2) dx

dy/dt = (9x²+2) dx/dt

if x = 2 and dx/dt=5 then

dy/dt = (9*2²+2)*5 = 38*5 = 190

4 0

3 years ago

In a football (soccer) league, teams receive 3 points for a win (W), 2 points for a tie (T) and 1 point for a loss (L).

Marrrta [24]

A) Total points = 3W + 2T + 1L

b) (3*5) + (2*2) + (3*1)
15 + 4 + 3 = 22
The Black Scot’s total points were 22

c) so, Wins + Ties + Losses = 10 because there were only 10 games played. but we also have to remember that we only can have 22 points. I just randomly plug in numbers until I get what I am looking for.

so I did 4 wins, 4 ties, and 2 losses. this is a total of 10 games, and the points equal 22. we just plug those values into our first equation:
(3*4) + (2*4) + (1*2)
12 + 8 + 2 = 22 points

7 0

3 years ago