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4 years ago

When you divide a number by 1/2, the result is

Mathematics

2 answers:

nika2105 [10]4 years ago

8 0

When you divide a number by 1/2, the result is twice the original number . Answer:B

Nikitich [7]4 years ago

6 0

Let us analyze the following situation: The number we want to divide by 1/2 is X. We can write:
X/(1/2)=(X/1)/(1/2)=(X*2)/(1*1)= X*2,
which means that the number that is divided with 1/2 is multiplied by 2 (twice the original number).
When you divide a number by 1/2, the result is twice the original number . Answer:B

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________ = ________________ = 0.50 ft/hr
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A unit rate is identified as a rate with 1 in the denominator. Therefor, a garden snail moves 0.50 feet per 1 hour.

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4 years ago

What is the equation in standard form of the line y = 19x + 5?

Inessa05 [86]

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4 years ago

Write the equation of a line that passes through the point (-2, 1) and has a slope of 4.

babymother [125]

Answer:

D. y = 4x + 9

Step-by-step explanation:

a line that passes through the point (-2, 1) and has a slope of 4

y = 4x + b

b = y - 4x

b = 1 - 4(-2)

b = 1 + 8

b = 9

So equation

y = 4x + 9

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4 years ago

A square plate RequalsStartSet (x comma y ): 0 less than or equals x less than or equals 1 comma 0 less than or equals y less th

larisa [96]

Answer:

Step-by-step explanation:

We are given the following:

$R = \{(x,y)|0\leq x \leq 1, 0 \leq y \leq 1 \}$

and $T(x,y) = 100-25x - 40 y$

a). Recall that a level curve of a function f(x,y) is given by $R_c = \{(x,y) | f(x,y) = c\}$ where c is a constant. That is, all the points in the set of interest to which the function applied to the points is exactly the value c.

Consider c = 80. So we get

$100-25x-40y = 80$

which implies that $y = \frac{-25}{40}x+0.5$ (Graph 1).

We can also consider c=60, which gives us

$100-25x-40y = 60$

which implies that $y = \frac{-25}{40}x+1$ . (Graph 2)

b)Recall that the gradient of a function f(x,y) is given by

$\nabla f = (\frac{df}{dx}, \frac{df}{dy})$

In this case,

$\frac{dT}{dx} = -25, \frac{dT}{dy} = -40$

Thus, the gradient of T is given by

$\nabla T =(-25,-40)$

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3 years ago

You need 550 mL of a 50% alcohol solution. On hand, you have a 55% alcohol mixture. How much of the 55% alcohol mixture and pure

vitfil [10]

We need 500 ml of alcohol mixture and 50 ml of water.

Step-by-step explanation:

The 50% concentration of the final solution is a result of mixing the 55% concentration with water, which is 0% concentration. Multiply the concentration of each liquid times the # of ml you will use, add these and divide by the total ml to get 50%

x = the number of ml of the 55% alcohol mixture

y = the number of ml of water

x + y = 550

$\frac{{0.55 x + (0) y }}{550} =0.50$

Again, the 0 above represents the water which is 0% concentration

$\frac{0.55 x}{550}$ = 0.50

0.55 x = 275

x = $\frac{275}{0.55}$ = 500

plug 500 into the equation x + y = 550

500 + y = 550

y = 50

Use 500 ml of the 55% solution and 50 ml of water.

5 0

3 years ago