Answer:
Y=-1
Step-by-step explanation:
y=-2(2)+3
y= -4 +3
-4+3=-1
y=-1
Call x the number of foreign stamps and y the number of local stamps.
We write equations:
x+y=80
2x/3=y-10
Adding ten to the last equation, we have:
y=2x/3+10
Substituting this for y in the first equation, we have:
5x/3+10=80
Subtracting ten, we have:
5x/3=70
Multiplying by 3/5, we see that x=42, and y=80-42=38, so there are 42 foreign stamps and 38 local stamps.
Answer:
6(7a + 9b) = 3(14a + 18b)
Step-by-step explanation:
We need to find the equivalent expression for the given expression i.e. 6(7a + 9b).
We can use the distributive property here such that,
a(b+c) = ab + ac
We have, a = 6, b = 7 and c = 9
6(7a + 9b) = 6(7a) + 6(9b)
= 42a + 54b
or taking 3 common from the above expression.
= 3(14a+18b)
Hence, the correct option is (a).
Answer:
100
Step-by-step explanation:
When t=0 (no time has passed), the coin is at height 100. This means the bridge must be 100 units high for this to be possible.
