Can you please help me

a) x=

10°

50°

130°

10°

50°

130°

170°

250°

290°

b) x=

90°

210°

330°

Step-by-step explanation:

2 sin (3x) = 1

a)  look at the graph, y=1 when x is near:

10°,  50°, 130°, etc

in the equation: 2 sin (3x) = 1  ⇒ sin (3x) = 0.5  ⇒ 3x = 30° (and others)  ⇒ x = 10° (and others).  So the values given in solution (10°,  50°, 130°, etc) are true

b) is evident

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation:

i think the answer is d im not sure