First you have to find the angle B (check attachment)

Then you can find the last angle inside the triangle, which I'll call C

Now you can find angle A

Step-by-step explanation:
they forget the last step which is to take the square root of the sum
7) a = 4
b = 17
a² + b² = c²
4²+ 17² = c²
16 + 289 = c²
305 = c²
√305 = c
17.464249196572980 = C
The answer is 7x+7/x^2+3x-10
920,438. 921,438-1,000=920,438
Answer:
Anything greater than or equal to 17.
Step-by-step explanation:
7/8 of 17 is 14.875