5 times (-17)= -85 so you should have said -85
Given that the two triangles are similar:

=


=

6x + 28 = 4 x 25
6x + 28 = 100
6x = 100 - 28
6x = 72
x = 12
Answer:
Total cost of Mark's board is $3.75.
Step-by-step explanation:
We are given the following in the question:
Length of wooden board =

Unit cost of board = $0.50 per foot
Total cost of board =

Thus, total cost of Mark's board is $3.75.
1st one :D I hope you have a good day/night!