There are seven full Octaves on a piano with 88 keys
(3x)^2 + 12x + 4
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Combine like terms 2n+3n= 5n, then you subtract 7 from both sides and get 5n=-48 -48/5= -9.6
Answer:
x•7+30=-24
Step-by-step explanation:
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Solution:
The given statement is :Two supplementary angles are congruent.
Two angles are said to be supplementary if sum of these two angles is 180°.
Let one Angle be A, then another angle will be 180 - A.
As given:
A≅180-A
A=180 -A
A +A= 180
2 A = 180
Dividing both sides by 2, we get
A= 90°
The Measure of each angle will be of 90°.
i.e , d = 90°