Marlisa has 23 seashells in her collection. she collects s more shells during a trip to the beach. then she doubles the number of sea cells in her collection by buying new shells at the souvenir shop. write an expression to find out how many seashells marlisa has after her visit to the souvenir shop?

right

step-by-step explanation:

step-by-step explanation:

in which figure is point g a centroid

look at the picture.

1.

ef : ab = 2 : 3

gf : cb = 2 : 3

gh : cd = 2 : 3

he : da = 2 : 3

2.

∠a ≅ ∠e

∠b ≅ ∠f

∠c ≅ ∠g

∠d ≅ ∠h

3.

use pythagorean theorem:

the length of the abcd trapezoid sides:

|ab| = 3 cm

|bc| = 10 cm

|cd| = 3(3) cm = 9 cm

|da| = 8 cm

the perimeter of abcd = 3 + 10 + 9 + 8 = 30 cm

the ratio of perimeters of the tarapezoids is equal 2 : 3.

substitute:

      cross multiply

      divide both sides by 3