find the value of x
a. 10
b. 6
c. 35
d. 21
explain please

Answer:
x = 10
Step-by-step explanation:
Assuming that the triangles are similar we can use ratios to solve for x.
x / 6 = 35 / 21
Using cross products we acquire,
35 * 6 = 210
21 * x = 21x
21x = 210
Divide both sides by 21
21x/21=x
210/21=10
x = 10