How many triangles can be formed by joining the vertices of an octagon?need answer and solution pls

The sum of two numbers is 58. the first number is 8 less than half the second number. let  c  represent the first number. let  drepresent the second number. which statements about solving for the two numbers are true? check all that apply.the equation    represents the sum of the two numbers.the equation    represents the sentence “the first number is 8 less than half the second number.”the equation    represents the relationship between the two numbers.the equation    represents the sum of the two numbers.the number  d  is 14.the number  c  is 44.the number  c  is 14.the number  d  is 44.

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form