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Blizzard [7]
3 years ago
11

9z(7z-4)=6 step by step please

Mathematics
2 answers:
mr_godi [17]3 years ago
5 0
Expand 9z(7z - 4): 63z^2 - 36z
63z^2 - 36z = 6
Subtract 6 from both sides
63z^2 - 36z - 6 = 6 - 6
Simplify
63z^2 - 36z - 6 = 0
z= 6 + radicant 78/ 21, z= 6- radicant 78/ 21
m_a_m_a [10]3 years ago
4 0
Distribute 9z to 7z and -4 
You get 56z^2 - 36z = 6 
56^2 - 36 - 6 = 0 
Solve using quadratic formula 
z is approx 0.78 and approx. -0.14
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a, the first option

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Answer:

6^10

Step-by-step explanation:

We know that a^ -b = 1/ a^b

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insulin comes in 10 cubic centimeter(cc) vials labeled in the number of units of insulin per cubic centimeter of fluid. A vial m
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Answer:

<em>8.25 cc fluid should be drawn into the syringe from the U40 vial.</em>

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50 points! Show your work!
Evgesh-ka [11]

Answer:

a)19.28≈x (rounded to the nearest hundredth)

b)7.66≈x (rounded to the nearest hundredth)

c)x≈8.39(rounded to the nearest hundredth)

d)x≈36.87 (rounded to the nearest hundredth) and y=5

Step-by-step explanation:

I'm going to first assume that all of these are right triangles.

If you look at the hint, it says SOHCAHTOA

This stands for the trigonometric functions

SOH tells us that sine(θ)=opposite/hypotenuse

CAH tells us that cosine(θ)=adjacent/hypotenuse

TOA tells us that tangent(θ)=opposite/adjacent

(ps. θ, or theta, stands for any angle measure)

Now, let's look at problem a.

We have the value of the hypotenuse and the value of an angle. We want to find the side opposite from the angle. So, in this case, we want to use the sine function.

sin(40)=x/30

30*sin(40)=x

19.28≈x (rounded to the nearest hundredth)

We can solve the other problems in a similar fashion.

Problem b

We have the hypotenuse, an angle measure, and we want to find the adjacent side. This is telling us to use the cosine function.

cos(40)=x/10

10*cos(40)=x

7.66≈x (rounded to the nearest hundredth)

Problem c

We have an angle measure, an adjacent value, and we want to find the opposite length, so we're going to use the tangent function.

tan(40)=x/10

10*tan(40)=x

x≈8.39(rounded to the nearest hundredth)

Problem d

We need to first solve for x, the angle measure.

We have an opposite length, an adjacent length, so we can use the tangent function to solve for the missing angle

Let's set up an equation

tan(x)=3/4

Using tan^{-1} or tangent inverse to cancel out the tangent, we get

x=tan^{-1}(3/4)

x≈36.87 (rounded to the nearest hundredth)

Now, let's solve for y, the hypotenuse!

Both the sine and cosine functions work, so I'm just going to pick one.

sine(36.87)=3/y

y*sin(36.87)=3

y=3/sin(36.87)

y=5

Side note: Although I rounded the angle measure, when calculating the y value, on my calculator, I did not round the value. Don't round until the end on your calculator, but it's okay to round on your paper.

PS. I used degrees for the angle measures, not radians, so if you want to retry these problems, make sure your calculator is calculating degrees, not radians, or else you might get some funky answers.

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