Answer:
(x+7) (x+3)
Step-by-step explanation:
x times x equals x2
3x + 7x = 10x
7 x 3 = 21
(x+7) (x+3)
Answer:

Step-by-step explanation:
According to the trigonometric ratios in aright triangle :

Given: ΔBCA ~ ΔSTR
Since , corresponding angles of two similar triangles are equal.
So, ∠C = ∠T ...(i) [Middle letter]
In triangle STR
...(ii)
From (i) and (ii), we have

X=10
-3 on both sides
Then -6(x+4)+3 to the other side
It would be the third one