How do i set up proportion’s and also cross multiply

u transpose all the constans to one side of the '=' sign and solve

Step-by-step explanation:

for example,

in  the first question

the sides of the triangles are proportional then,

25/30 = x/ 10

=> (25x10)/30 = x

=> 250/30 = x

=> 8.33

im pretty sure like this u can do the rest, ;)

step-by-step explanation:

you divide the denominator by the numerator on both sides and if the quotients are equal then the fractions are equivalent