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3 years ago

Lu can type 140 words in 5 minutes, and Ray can type 140 words in 4 minutes. how many can she type in 10 mins

Mathematics

1 answer:

kotegsom [21]3 years ago

4 0

Answer:

280

Step-by-step explanation:

Lu can make 140 words in 5 mins which if means if she has 10 mins

and 5 x 2 is 10

then 140 x 2 = 280

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A greeting card company can produce a box of cards for $7.50. If the initial investment by the company was $50,000, how many box

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Answer:

If cost of one box of card is $7.50 then the no of cards produced is 6667 cards and if cost of one box of card is $10.50 then the no of cards produced is 4762 cards

Step-by-step explanation:

The cost of one box of cards = $7.50

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4 years ago

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3 years ago

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What number would you add to the equation below to complete the square?x2 + 4x = 0?

julia-pushkina [17]

------------------------------------------------------------------
Equation
------------------------------------------------------------------
x² + 4x = 0

------------------------------------------------------------------
Add a constant
------------------------------------------------------------------
x² + 4x + (4/2)² - (4/2)² = 0 ← Add 2² to form perfect square

------------------------------------------------------------------
Evaluate bracket
------------------------------------------------------------------
x² + 4x + 2² - 2² = 0

------------------------------------------------------------------
Form the perfect square
------------------------------------------------------------------
(x + 2)² = 4

------------------------------------------------------------------
Square root both sides
------------------------------------------------------------------
(x+2) = $\pm$ √4

------------------------------------------------------------------
Evaluate the square root
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(x+2) = $\pm$ 2

------------------------------------------------------------------
Solve x
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x = 2 - 2 or x = -2 - 2

x = 0 or -4

------------------------------------------------------------------
Answer: The constant to add is 4 and the value of x = 0 or -4
------------------------------------------------------------------

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4 years ago