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1 year ago

Need heeeelp please

Mathematics

1 answer:

Stella [2.4K]1 year ago

3 0

72/w^6x^9
Not a 100% sure.

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Eric needs 1/2 deck of playing cards for a magic trick. He only has 2/7 of a deck. What fraction of a deck does Eric still need?

tatyana61 [14]

Answer: Eric still needs $\frac{3}{14}$ of a deck.

Step-by-step explanation:

You know that:

- Eric need 1/2 deck of playing cards.

- Eric has 2/7 of a deck.

Therefore, to find the fraction of a deck that Eric still needs, you must subtract 1/2 and 2/7:

- Find the least common multiple of the denominators:

$2=2*1\\7=7*1$

$LCM=2*7*1=14$

- Now, you can make the subtraction:

$\frac{(7*1)-(2*2)}{14}=\frac{7-4}{14}=\frac{3}{14}$

Therefore, he still needs $\frac{3}{14}$ of a deck.

4 0

2 years ago

A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9.

erastovalidia [21]

Answer:

C: 4

Step-by-step explanation:

You call the number x. Then you do (x-7) * 3= -9.

3x-21=-9

3x=12

x=4

5 0

2 years ago

Read 2 more answers

Ricardo has 2 cases of video games With the same number of games in each case.He gives 4 games to his brother. Ricardo has 10 ga

son4ous [18]

7 video games were in each case.

Step-by-step explanation:

-So, Ricardo has 2 cases of video games with the same amount of games per case.

-He gives 4 games to his brother and is left off with 10 games.

Add 10+4 to get the total amount of games.

Since there are 2 cases, divide the total amount of games (14) by the total amount of video game cases.

This gets us 7, which is the starting amount of video games in each case.

8 0

1 year ago

Find the value of x. Polygon angle sums

pav-90 [236]

Answer:

x = 50

Step-by-step explanation:

In a polygon, the angles add up to 360°:

x + 10 + 2x + 3x + x = 360

7x + 10 = 360

7x = 350

x = 50

6 0

3 years ago

Read 2 more answers

In a sample of 150 cars, 18 cars failed a safety inspection. The sampling method had a margin of error of 0.02

mestny [16]

Answer:

(Lower limit, Upper limit) = (0.10, 0.14)

(Lower limit, Upper limit) = (10%, 14%)

Step-by-step explanation:

Total number of cars = 150

Cars that failed the safety inspection = 18

The proportion is given by

p = 18/150

p = 0.12

p = 12%

The confidence interval is given by

p ± margin of error

Where margin of error is 0.02

0.12 ± 0.02

Lower limit = 0.12 - 0.02

Lower limit = 0.10

Lower limit = 10%

Upper limit = 0.12 + 0.02

Upper limit = 0.14

Upper limit = 14%

(Lower limit, Upper limit) = (0.10, 0.14)

(Lower limit, Upper limit) = (10%, 14%)

7 0

2 years ago

Need heeeelp please​

Need heeeelp please