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s344n2d4d5 [400]
3 years ago
7

Please help me I don't understand!

Mathematics
2 answers:
Naily [24]3 years ago
7 0
3. For this one, we know that the sum of the angles is equal to 115 and we have the measure of one angle. So, we will subtract the one angle from the total to get the measure of the second angle. 115-90=25
4. We will do the same for this one as we did in number 3. The sum of the angles is 70, and one of the angles is 40. 70-40=30
5. Lets add the two angles up first. 45+45=90. Two angles that add up to 90 are complementary angles. 
Kobotan [32]3 years ago
6 0
#3) since angle ABC is 115 degrees, to find EBC you simply have to subtract 115 from 90 and the answer is 25 degrees. 
#4)DGJ would be 30 degrees because you take 70 minus 40.
#5) a 90 degree angle. 
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Answer:

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Step-by-step explanation:

Givens

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  • Let the second number be n
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Equation

(n - 1)(n)(n + 1) - (n-1 + n + n+1) = 480

Solution

Multiply (n - 1) and (n + 1) = (n - 1)*(n + 1) = n^2 - 1

Multiply the second integer by the result of the first and third: n (n^2 - 1)

Add the three integers together: (x - 1) + (n - 1) + n = 3n  Combine these 2 steps

n(n^2 - 1) - 3n = 480 Remove the brackets

n^3 - n - 3n = 480

n^3 - 4n = 480

n^3 - 4n - 480 = 0

Graph

The graph shows that the intercept point is n =8. This is the only way I can see to solve this cubic. There are no other real roots.

Answer

n - 1 = 7

n = 8

n + 1 = 9

Check

Product 7*8*9 = 504

Sum = 7 + 8 + 9 = 24

504 - 24 = 480 Which checks.

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