Subtracting a number is the same as adding its opposite. Use this understanding to complete each of the equations below. Enter numbers to evaluate ‐13−23 .
‐13−23= ‐13 +
=
Enter numbers to evaluate ‐13−(‐23)
.
‐13−(‐23)= ‐13 +

Arianna is buying plants for her garden. she buys 15 flowering plants for $96. pink flowering plants sell for $8, and purple flowering plants sell for $5. how many pink flowering plants did arianna buy? i figured out the answer! the answer is 7. 8x +5y = 96 plug in 7 for x 8 (7) + 5y = 96 56 + 5y = 96 subtract 56 from both sides 5y/y = 40/5 y = 8 she bought 7 pink and 8 purple plants

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18