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Vaselesa [24]
3 years ago
13

When ms. shreve solved an equation in class, she checked her solution and found that it did not make the equation true! Examine

her work below and find her mistake. Then find the correct solution.
5(2×-1)-3×=5×+9
10×-5-3×=5×+9
7×-5=5××9
12×=4
×=1/3
Mathematics
1 answer:
Alex777 [14]3 years ago
6 0
The first part of the second line, she left the -5 there. The correct work and solution should be this:
5(2x-1)-3x=5x+9
<span><span>7x</span>−5</span>=<span><span>5x</span>+<span>9
</span></span>2x-5=9
2x=14
x=7
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The scale of a map says that 4 cm represents 5 km.
andriy [413]

Answer:

a. 3.2 cm

b. 6.25 km

Step-by-step explanation:

a.

(4 km)/(5 km) = 0.8

4 km is 0.8 of 5 km, so in the map it is 0.8 of 4 cm.

0.8 * 4 cm = 3.2 cm

Answer: 3.2 cm

b.

(5 cm)/(4 cm) = 1.25

5 cm is 1.25 times 4 cm, so it represents 1.25 * 5 km.

1.25 * 5 km = 6.25 km

Answer: 6.25 km

3 0
3 years ago
Last year, the Humane Society found 96 homes for its stray kittens.
omeli [17]
32 homes. divide 96 by 3 because the 96 homes each took 3 kittens
3 0
3 years ago
William is 3 years, older than Charmine. The sum of 3 times Charmaine's age and 2 times William's age is 76. How old are William
lana66690 [7]

William is 17 years old and Charmaine is 14 years old.

Step-by-step explanation:

Let x be the age of William and y be the age of Charmaine

Then

William is 3 years, older than Charmine.

x = y+3    Eqn 1

The sum of 3 times Charmaine's age and 2 times William's age is 76.

2x+3y = 76     Eqn 2

Putting x = y+3 in Eqn 2

2(y+3)+3y=76\\2y+6+3y=76\\5y+6=76\\Subtracting\ 6\ from\ both\ sides\\5y+6-6=76-6\\5y=70\\Dividing\ both\ sides\ by\ 5\\\frac{5y}{5} = \frac{70}{5}\\y=14\\Putting\ the\ value\ of\ y\ in\ Eqn\ 1\\x=y+3\\x=14+3\\x=17

Hence,

William is 17 years old and Charmaine is 14 years old.

Keywords: Linear equations, Variables

Learn more about linear equations at:

  • brainly.com/question/899976
  • brainly.com/question/884169

#LearnwithBrainly

5 0
3 years ago
Is x= -2 a solution to 3x-6-12?
Ann [662]

Answer:

Actually x would be 6

4 0
3 years ago
Read 2 more answers
Luna ray has 1 orange pick for every 2 green picks.How many green picks does Luna have if she has 12 total picks?
Lana71 [14]

Answer:

8 green picks

Step-by-step explanation:

Since this problem is a ratio that also gives a total, setting up equivalent ratios in a table with the total would be a good way to find the answer.  Since there is 1 orange pick for every 2 green picks and there are a total of 12 picks, we can set up the following:

Orange 1 2 3 4 5

Green 2 4 6 8 10

Total 3 6 9 12 15

You can see from the table, that when there are 12 total picks, 4 of them are orange and 8 of them are green.  


6 0
3 years ago
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