Write a letter to a friend telling him or her about plans you have for an excursion and inviting him or her to join you.
Answer:
-16 because the difference in between 10 and -4 is -16
Answer:

Step-by-step explanation:
Multiply those together and combine like terms. Then make sure you order the terms in descending powers.
Answer:
Step-by-step explanation:
If congruent the sides are equal
15x-9=7x+11
8x=20
x=20/8=2.5
If 100 students make up 40% of the 6th grade population, then 50 students make up 20% of the 6th grade population. 20% × 5 makes 100% so if your multiply 50 by 5 you'd get your population.
50 × 5 = 250 sixth-graders