Three sisters purchased a dress of equal value. One of the sisters purchases a purse for $26.00. If the grand total was $249.50, how much did each dress cost? I need an answer by today please! :)

Three times the sum of a number and seven is negative thirty-six. what is the number?

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

10x − 5y + 14 = 0 whats the answer pls