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3 years ago

What is keep change or flip method

2 answers:

7 0

Answer: Keep change change are used in division, like if I had 10 divided by -5 I would keep the 10 change division to multiplication and change the 5 to a positive : 10 X 5

yan [13]3 years ago

5 0

KCF, when doing a division fraction problem, you keep the first fraction, change the division into multiplication, and flip the other fraction. For example:
1/4 / 4/7
turns into
1/4 x 7/4
it makes it easier to solve

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Is 4,800 milliliters equal, less than, or more than 4.2 liters?

Andrews [41]

Answer:

less than

Step-by-step explanation:

because

1 l= 1000 ml

so 4.2 l= 4.2x1000

= 4200 l

so 4200<4800

8 0

3 years ago

Read 2 more answers

F(x) = lnx/x

My name is Ann [436]

$f(x) = \frac{lnx}{x}$

(a) $f'(x) = \frac{d}{dx}[\frac{lnx}{x}]$
Using the quotient rule:
$f'(x) = \frac{\frac{1}{x} \cdot x - lnx}{x^{2}}$
$f'(x) = \frac{1 - lnx}{x^{2}}$

For maximum, f'(x) = 0;
$\frac{1 - lnx}{x} = 0$
$lnx = 1, x = e$

(b) Deduce:
 $e^{x} \geq x^{e}, x > 0$

Soln: Since x = e is the greatest value, then f(e) ≥ f(x) > f(0)
$\frac{ln(e)}{e} \geq \frac{lnx}{x}$
$\frac{1}{e} \geq \frac{lnx}{x}$ , since ln(e) is simply equal to 1

Now, since x > 0, then we don't have to worry about flipping the signs when multiplying by x.
$\frac{x}{e} \geq lnx$
$x \geq elnx$
$x \geq ln(x^{e})$

Taking the exponential to both sides will cancel with the natural logarithmic function in the right hand side to produce:
$e^{x} \geq e^{ln(x^{e}})$
$e^{x} \geq x^{e}$ , as required.

3 0

3 years ago

What is the vertex (x,y)? h(t)=2x^2+4x+7 PLS SHOW WORK

Nesterboy [21]

Hack
for y=ax^2+bx+c
the xvalue of the vertex is -b/2a
and the y value is found by subsituting that for x

so

-b/2a

h(t)=2x^2+4x+7
a=2
b=4
-b/2a=-4/(2*2)=-4/4=-1
the y value
h(-1)=2(-1)^2+4(-1)+7
h(-1)=2(1)-4+7
h(1)=2+3
h(1)=5

(-1,5) is da vertex

6 0

3 years ago

Order the following decimals from least to greatest. 9.036, 9.982, 9.535

Leona [35]

The order is: 9.036, 9.535, and 9.982.

8 0

3 years ago

Plzzzzzz helppp idk what the answer is

Annette [7]

Your answer is the last option

54-6i/41

4 0

3 years ago