A regular pentagon of side 10cm with star inside. calculate the area of the star​

Which formula gives the area of a triangle? a=1/2(b+h)

You and a friend went to the movies.you spent half your money on tickets. then you spent 1/4 of the money on popcorn, $2 on candy, and $3 on a soda. if you have $1 left, hiw much money did u take to the movies?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class