Answer:
4 brothers and 3 sisters
Step-by-step explanation:
Let x be the number of brothers and y be the number of sisters in the family.
1. Each brother has x-1 brothers and y sisters. If each brother has as many sisters as brothers, then

2. Each sister has y-1 sisters and x brothers. If each sister has twice as many brothers as she has sisters, then

3. Solve the system of two equations:

Then

Answer:
A.... -5
Step-by-step explanation:
<u><em>-35 + 30 = -5</em></u>
The easiest way to tell if a number is rational or not is to attempt to express it as a fraction. If you can, then the number is rational. If not, then the number is irrational. All integers are rational numbers, because they can be written as a fraction (for example, the integer 8 = 8/1). But numbers like pi or sqrt(2) cannot be written as a fraction and are not rational.
Answer:
every new hour, the previous amount of bacteria is multiplied by four.
Step-by-step explanation:
Answer:
20.32 cm for each bracelet.
Step-by-step explanation:
121.92 ÷ 2 = 60.96
60.96 ÷ 3 = 20.32