Mary checked a book out of the public library two days ago, and she read half of the book that night. yesterday, she read another 40% of the book. What fraction of the book does Mary have left to read today?​

Since she read half of the book, it's 50%+ the 40% she read yesterday, that make 90%.So she is left with 10%

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.