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3 years ago

Which of the following is an extraneous solution of square root -3x-2=x+2

SAT

2 answers:

levacccp [35]3 years ago

7 0

Answer:
d. x = 6

Steps:
First, You square both sides to cancel the square root. Leaving -3x -2 on one side and 2x + 4 on the other.

Second, combine like terms. Subtract -2x both sides and add 2 both sides.

Third, that will give you 3x - 2x = 4 + 2. Which gives you x = 6.

aleksley [76]3 years ago

6 0

Answer:

A) -6

Explanation:

I just took the pretest and got 100%

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If 2 cars traveling towards one another are 100 miles apart and car A is traveling at 55 miles/hour, while car B is traveling at

Pepsi [2]

Answer:

Explanation:

The time when they meet is t in hours

The general formula for both cars is d = r*t

t is unknown

r1 = 55 mph

r2 = 60 mph

60 mph * t + 55 mph*t = 100 miles

t * (60 mph + 55 mph) = 100 miles

t * 115 = 100 miles

t = 100 miles / 115 mph

t = 0.8696 hours

1 hour has 60 minutes

0.8696 hour = x

x = 0.8696 hours * 60

x = 52 minutes and 10 seconds

They will meet at 2:52:10

You have to give answers to get the time to agree.

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2 years ago

Introductory blurbs often contain valuable information. They'll always provide basic information about the passage, like title a

Valentin [98]

Answer: symbiosis is not always mutually

Explanation:

Introductory blurbs often contain valuable information. They'll always provide basic information about the passage, like title and author name, but they can also contain important definitions or pieces of useful background knowledge.

8 0

2 years ago

For the galvanic (voltaic) cell fe(s) + mn²⁺(aq) ⟶ fe²⁺(aq) + mn(s) (e° = 0.77 v at 25°c), what is [fe²⁺] if [mn²⁺] = 0.050 m an

Nuetrik [128]

The concentration of Iron in the galvanic (voltaic) cell Fe(s) + Mn²⁺(aq) ⟶ Fe²⁺(aq) + Mn(s) is 0.02297 M.

<h3>What is the Nernst Equation?</h3>

The Nernst equation enables us to identify the cell potential(voltage) in presence of non-standard conditions in a galvanic cell. It can be expressed by using the formula:

$\mathbf{E_{cell} = E_o - \dfrac{0.059}{n} \times log \dfrac{[Fe^+]}{[Mn^{2+}]}}$

where;

n = Number of electrons = 2
$\mathbf{E_o}$ = Initial voltage = 0.77 V
$\mathbf{E_{cell}}$ = Cell voltage = 0.78 V
$\mathbf{[Mn^{2+}]}$ = Manganese concentration = 0.050 M

Replacing the values into the above equation, we have:

$\mathbf{0.78 = 0.77 - \dfrac{0.059}{2} \times log \dfrac{[Fe^{2+}]}{[0.050]}}$

$\mathbf{0.78 -0.77= -0.0296\times log \dfrac{[Fe^{2+}]}{[0.050]}}$

$\mathbf{log^{-1} (-0.3378) = \dfrac{[Fe^{2+}]}{[0.050]}}$

$\mathbf{Fe^{2+} = (0.4594\times 0.050 )\ M}$

$\mathbf{Fe^{2+} =0.02297 \ M }$

Learn more about using the Nernst equation here:

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2 years ago

Jennifer has $25. 00 and earns $0. 50 for every chore she completes. Amaya has $13. 00 and earns $2. 00 for every chore she comp

uranmaximum [27]

Taking into account the definition of equation, each girl must complete 8 chores to have the same amount of money.

<h3>Definition of equation</h3>

An equation is the equality existing between two algebraic expressions connected through the equals sign in which one or more unknown values, called unknowns, appear in addition to certain known data.

Each equation has two members, and these are separated by using the equal sign (=).

Each member is made up of terms.

The unknowns, that is, the values to be found, are represented by letters.

The equality between the two algebraic expressions is only verified or true for certain values of the unknown.

<h3>Amount of chores</h3>

To find the amount of chores in this case, in first place you know Jennifer has $25.00 and earns $0.50 for every chore she completes. The money that Jennifer saves is expressed as: 25 + 0.50x, being x the amount of chores that Jennifer sells.

On the other side, Amaya has $13.00 and earns $2.00 for every chore she completes. The money that Amaya saves is expressed as: 13 + 2x, being x the amount of chores that Amaya sells.

They have the same amount of money, then it is expressed by the equation:

25 + 0.50x= 13 + 2x

Taking into account that:

When a value you are adding is passed to another side of the equation, this value will be passed by subtracting.
If a value you are subtracting is passed to the other side of the equation, this value will be passed adding.
When a value you are dividing goes to another side of the equation, it will be multiplied.
If a value is multiplying it passes to the other side of the equation, then it will pass dividing.

The equation is solved as:

25 -13= 2x - 0.50x

12= 1.5x

12÷ 1.5= x

8=x

Finally, each girl must complete 8 chores to have the same amount of money.

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