The answer is 6. 49 you welcome :)
The measure would be 20 since five times four is 20
it's either a or b, not sure but I think it's b
After understanding the problem, formulate equations to determine the unknown. Let x be the price of one book. Equating Alana&Petra's expense with Angus' would be
5x + 4x +5 = 19x - 10
The 5 in the left side is needed because Angus' expense is $5 more. Also, the 10 on the right side represents the $10 discount. Solving the equation,
19x = 9x = 5+10
10x = 15
x = $1.5
Therefore, the book costs $1.5.
You use distributive property. So (5 x 2)-(5 x x)= 10 - 5x.
