Help! it gives me two different answers!! Thanks

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Acomposition of transformations maps δxyz to δx"y"z". the first transformation for this composition is , and the second transformation is a 90° rotation about point x'.