There are 105 in 6th grade because there are 75 boys right? So it said the ratio of girls is 7 and the ratio of boys is 5 so I divided 75 to 5 = 15 and I multiply 7 to 15 and got 105 girls.
Hello, we know there are 12 inches in one foot, so in 12 feet, there are 144 inches.
Hope i understand it right
9y^2 -12y^4 = 3y^2 *(3 - 4y^2)