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2 years ago

7.2 x 10^-2 and 3 x 10^-1

Mathematics

1 answer:

Tom [10]2 years ago

5 0

Answer:

7.2 × 10(24) 5.3 ×10-1

(7×2)×(10×24)×(5×3)×10-1

14×240×15×10-1

50400×10-1

504000-1=5403999

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kotykmax [81]

A(b-c)=ab-ac

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6 and 1/7+1/21h-1/14
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3 years ago

(Middle school math) please help, thank you!

valentina_108 [34]

Answer:

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2 years ago

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satela [25.4K]

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2 years ago

Please help

nikitadnepr [17]

Answer:

The value of x is $\frac{-2}{5}$ .

Step-by-step explanation:

Given expression is:

$\frac{2}{3}(x-2)=4x$

We have to solve this for x.

First we will multiply both sides of the equation by 3

$3*\frac{2}{3}(x-2)=4x*3$

2(x-2) = 12x

2x-4=12x

Now we will be subtracting 2x from both sides of the equation

2x-2x-4=12x-2x

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The value of x is $\frac{-2}{5}$ .

8 0

2 years ago

Lucy earns money babysitting. Her earnings and hours worked represent a direct variation. She worked for 4 hours and earned $25.

SashulF [63]

For this case we have that by definition, a direct variation is given in the form:

$y = kx$

Where:

k: It is the constant of proportionality

According to the statement we have to:

$y = 25\\x = 4$

Substituting:

$25 = k4\\k = \frac {25} {4}$ $k = 6.25\ for\ \frac {dollars} {hour}$

On the other hand we have:

$y = 4\\x = 25\\4 = k25\\k = \frac {4} {25}$

$k = 0.16\ for\ \frac {hours} {dollar}$

Answer:

$k = 6.25 for \frac {dollars} {hour}\\k = 0.16 for \frac {hours} {dollar}$

7 0

2 years ago