Answer:
17.2°
Explanations
To find angle A, use the cosine rule.
a^2 = b^2 + c^2 - 2 × a × c cos A
4^2 = 7^2 + 10^2 - 2 × 7 × 10 cos A
16 = 49+ 100 - 140 × cosA
16 = 149 - 140cosA
16- 149 = - 140cosA
-133 = - 140cosA
cosA = 133/140
cosA = 0.95
A = 17.2°
4^2+3^2=25
sqrt 25= 5
Answer is 5
72 is multiples of 3,9, and 12
First simplify the equation and next multiply the 20 with the x^2 and find a number that adds together to give you the middle
