Is this right. Please help me

How many $20 bills do you need to have to make $280

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Which of the following could be the ratio of the length of the longer leg 30-60-90 triangle to the length of its hypotenuse? check all that apply. a. 313 6 b. 3: 215 c. 18: 13 d. 1: 13 e. 13: 2 of. 3: 15