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SashulF [63]
3 years ago
8

Justin is evaluating the expression 12.5 + 3.8x, when x is 7.9

Mathematics
2 answers:
sveticcg [70]3 years ago
5 0
Ok so this is an output/input question u will do 12.5 + 3.8(7.9) =x so in order to get x u will do 7.9 × 3.8 which gives u 29.64 then u will add that to 12.5 which gives u x = 46.14
salantis [7]3 years ago
4 0

Answer:

Justin should have Multiplied 3.8 and 7.9 first

Step-by-step explanation:

Because all these people that have the wrong answer got me mad

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If sin A + sin^3 A = cos^2 A, prove that cos^6 A - 4cos^4 A + 8cos^2 A = 4.
Sphinxa [80]

Answer:

Step-by-step explanation:

sinA(1+sin^2A) = cos^2A

sinA(2 -cos^2A) = cos^2A

Squaring both sides,

sin^2A(4-4cos^2A +cos^4A) = cos^4A

(1-cos^2A)(4-4cos^2A +cos^4A) = cos^4A

4-4cos^2A +cos^4A-4cos^2A+4cos^4A-cos^6A = cos^4A

4 -cos^6A +4cos^4A -8cos^2A = 0

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hence proveproven

4 0
1 year ago
Read 2 more answers
A triangular playground has angles with measures in the ratio 8:3:9. What is the measure of the smallest angle? I need an explan
frozen [14]

Answer:

Measure of smallest angle will be 27 degrees.

Step-by-step explanation:

We are told that a triangular playground has angles with measures in the ratio 8:3:9 and we are asked to find out measure of smallest angle.

Since we know by the angle sum property that angles in a triangle add up to 180 degrees.

We can set an equation from our given ratio as:

8x+3x+9x=180^{o}

20x=180

x=\frac{180}{20}

x=9

Now we will find measure of our smallest angle by multiplying 3 by 9 as 3x will be smallest angle of our triangle.

3*9=27

Therefore, measure of the smallest angle will be 27 degrees.

4 0
3 years ago
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3 years ago
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4 0
2 years ago
Two balls are drawn in succession out of a box containing 5 red and 5 white balls. Find the probability that at least 1 ball was
Lera25 [3.4K]
Check the tree diagram of the problem:

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The branches represent all possible scenarios. 

For example, consider the upper branch, the case when both balls are blue:

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The other branches have the same logic.

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4 0
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