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8090 [49]
3 years ago
5

Erica solved the equation −5x − 25 = 78; her work is shown below. Identify the error and where it was made. (5 points) −5x − 25

= 78 Step 1: −5x − 25 − 25 = 78 − 25 Step 2: −5x = 53 Step 3:negative five times x over negative five = fifty-three over negative five Step 4: x = negative fifty-three over five Group of answer choices Step 1: She should have added 25 to each side. Step 1: She should have divided both sides by −5. Step 3: She should have divided both sides by −5. Step 3: She should have multiplied both sides by −5.
Mathematics
1 answer:
Fofino [41]3 years ago
5 0

Answer:

x = -20.6

Step-by-step explanation:

Step 1: −5x − 25 − 25 = 78 − 25

Should be

Step 1: -5x-25+25=78+25

Step 2: -5x=103

Step 3: Divide both sides by -5: x = -20.6

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Theresa has $12 in nickels amd quarters if she has the same number of each kind of coin how many nickels and quarters does she h
Bogdan [553]

n=# of nickels

q=# of quarters

$12 is 1200 cents

5n+25q=1200

n=q

substitute q for n or n for q

5q+25q=1200

30q=1200

q=1200/30

q=40 quarters and therefore n=40 nickels

40 quarters is $10 and 40 nickels is $2, therefore you have $12

Hope this helps.

4 0
3 years ago
Given the functions f(x) = 2x – 1 Tand g(x) = 2x + 4, which operation results in the largest coefficient on the x term
sammy [17]
<h2>Answer:</h2>

Multiplication.

<h2>Step-by-step explanation:</h2>

Given functions:

f(x) = 2x - 1

g(x) = 2x + 4

Let's perform some basic arithmetic operations on them to see which will result in the largest coefficient of the x term

i. Addition.

f(x) + g(x)

(2x - 1) + (2x + 4)

2x - 1 + 2x + 4

4x + 3

Here, the x term has a coefficient of 4

ii. Subtraction

f(x) - g(x)

(2x - 1) - (2x + 4)

2x - 1 - 2x - 4

-5

Here, the x term does not exist or has a coefficient of 0

iii. Multiplication.

f(x) * g(x)

(2x - 1) * (2x + 4)

4x² + 8x - 2x - 4

4x² + 6x - 4

Here, the x term has a coefficient of 6

iv. Division

Division is not exactly applicable here since there are not terms cancelling out.

Therefore, the multiplication operation will result in the largest coefficient on the x term with the coefficient being 6

7 0
3 years ago
You run 1/12 mile in 1/2 minute. How many miles per minute do you run?
svet-max [94.6K]

Answer:

<h3>1/6 miles / min.</h3>

Step-by-step explanation:

speed = distance / time

          = <u>1/12 mile</u>

              1/2 min.

          = 1/6 miles / min.

5 0
3 years ago
Find the exact length of the third side.<br> 6 9
solniwko [45]

Answer:

The square root of 45

Step-by-step explanation:

9^2-6^2=c^2

81-36=c^2

45=c^2

c=sqrt(45)

3 0
3 years ago
Read 2 more answers
pls help immediately! this is due in 3 mins :/.(i’ll mark brainiest if u don’t leave a link just help me pls!)
Serhud [2]

Answer:

They help the tree reach deep into the sandy soil for nutrients and ground water.

Step-by-step explanation:

The job of a tree's roots is to collect water and nutrients.

5 0
3 years ago
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