Answer:
0
Step-by-step explanation:
-10 + 10
-10 and 10 are additive inverses, so when we add them, it is equal to zero
-10 + 10 = 0
Try this: Combine 6 and 9, obtaining 15.
Compare this sum, 15, to the length of the 3rd side: 15.
If placed end to end, the 2 sides with lengths 6 and 9 form a new line of length 15. We'd end up with this new line superimposed on the 3rd side (with length 15).
Think: Do 2 straight lines of length 15, superimposed on one another, form a triangle?
15 postcards, 10
envelopes, and a notepad cost------------------- 1.68 dolars
Postcards------------x
Envelopes------------y
Notepad--------------z
15x+10y+z=1.68
<span>Y=z/8 y=0.02+x</span>
<span>Z=8y x=y-0.02</span>
15(y-0.02)+10y+8y=1.68
15y-0.30+18y=1.68
<span>33y=1.98 y=0.06</span>
Z=8*0.06=0.48
X=0.06-0.02=0.04
Costs
Postcards------------0.04
dolars/ 4 cents
Envelopes------------0.06
dolars/ 6 cents
<span>Notepad--------------0.48
dolars/ 48 cents</span>
-308° and 412° because 52-360 is -308 and 52+360 is 412
Answer:
240
Step-by-step explanation:
Because you have to do length times with times height
12 times 10 times 2= 240
