Im in 9th grade algebra. and we are learning adding and subtracting real numbers. im stumped on a couple of problems. I get confused when i see the absolute value lines. Does that change the munber? Do i just go on with the problem as if they werent there?

Question

Im in 9th grade algebra. and we are learning adding and subtracting real numbers. im stumped on a couple of problems. I get confused when i see the absolute value lines. Does that change the munber? Do i just go on with the problem as if they werent there? 
And i have NO idea how to do 2/5 - 7/8?!?

oneirocritic · Answer

2/5 - 7/8 = 2*8/5*8 - 7*5/8*5 = 16/40 - 35/40 = -19/40

claire · Answer

7/20

chris · Answer

1. find the latreal area of a cylinder of revolution if its altitude is 5.5 inches and the diameter of its base is 7 inches.

Hadassah · Answer

idk im in 9H soo idc either i juss need my ? answered duhhh!!!!! y else wouldi b here

Corinne · Answer

what is 10 to the second power in standard form? Please answer by the end of today. Please and Thank You Corinne Moore

Corinne · Answer

O and btw im in 8H buhh its high skool work so yahh Earth Sci all that good stuff Corinne Moore

Karen · Answer

y=-2x^2-3

Karen · Answer

Quadratic functions quest

Sytashia · Answer

y=-2x^2-3

mckayla · Answer

Put these numbers in order from least to greatest. - 1 2 - 3 10 2 24 30 Submit

britany · Answer

1223102430

Cathy · Answer

Make an input-output table for the function use 0,1,2,3,4,5 as the x value. Y=5(15-x)

Del Ali · Answer

Start with a numberX and 12,then divide by 4,next subtract7, and finally multiply by 2. a. convert the description to an algebraic expression. b.ifx=5,what is the value of the expression?