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4 years ago

Helppp meee please!!

Mathematics

2 answers:

MariettaO [177]4 years ago

6 0

Vertical stretch ununinin

kolbaska11 [484]4 years ago

3 0

Vertical stretch

Hope this helps! :)

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Express 9.21212121212... as a rational number, in the form pq

Mice21 [21]

$x=9.212121\ldots=9.\overline{21}$
$100x=921.212121\ldots=921.\overline{21}$
$99x=921.\overline{21}-9.\overline{21}=921-9=912$
$\implies x=\dfrac{912}{99}=\dfrac{304}{33}$

7 0

3 years ago

F(x)=4x+7. Find the inverse of f(x).

liraira [26]

Answer:

Step-by-step explanation:

f(x) = y = 4x + 7

Solve for "x"

4x + 7 = y ⇒ x = $\frac{1}{4}$ y - $\frac{7}{4}$

Exchange the places "x" and "y"

$f^{-1}$ (x) = $\frac{1}{4}$ x - $\frac{7}{4}$

or $f^{-1}$ (x) = $\frac{x-7}{4}$

8 0

3 years ago

What is the place value of the 4 in 475

Sergio [31]

The 4 is in the hundreds place

7 0

3 years ago

Myra is a scientist and needs 45 gallons of a 16% acid solution. The lab is currently stocked only with a 20% acid solution and

asambeis [7]

Answer:

The volume of the solution with 20% acid is 27 gallons and the one with 10% acid is 18 gallons

Step-by-step explanation:

Myra needs to mix "x" gallons of the solution with 20% and "y" gallons of the solution with 10%. The volume of the final solution must be 45 gallons, therefore:

x + y = 45

The concentration of acid of the final solution is:

0.2*x + 0.1*y = 45*0.16

0.2*x + 0.1*y = 7.2

Therefore we have a system of equation:

x + y = 45

0.2*x + 0.1*y = 7.2

We need to multiply the first equation by -0.1:

-0.1*x -0.1*y = -4.5

0.2*x + 0.1*y = 7.2

We now sum both equation:

0.1*x = 2.7

x = 2.7/0.1 = 27 gallons

y = 45 - 27 = 18 gallons

6 0

4 years ago

Which points lie on the graph of f(x) = log9x?<br> Check all that apply.

valkas [14]

Answer:

Let

y=f(x)

y=log9x

we know that

applying property of logarithms

y= log9x is equal to

------> equation 1

case 1) (-1/81, 2)

x=-1/81

y=2