Is she has 60 and half was used that would be 30 minus 3/8 and 3/8 is 0.375 which if u subtract 60-30-0.375 it would be 29.625 I’m pretty sure! Sorry if this didn’t help
Let x represent number of 16-cent stamps and
let y represent number of 7-cent stamps
we can write equation:
16*x + 7*y = 129
Now, the problem is that we need both x and y to be whole numbers for obvious reasons. you cant put half a stamp.
We can do this by iteration and check for results. Obviously x cant be larger than 8 because:
8*16 = 128 and there is no room for 7-cent stamp
lets try 7:
7*16 = 112. remainder is 17 which isnt divisable by 7
for 6:
6*16 = 96. remainder is 33 which again isnt divisable by 7
but for 5 we get good result.
5*16 = 80. remainder is 49 which divided by 7 gives us 7
that means 5x 16 cent stamps and 7x 7 cent stamps
Answer:
1500
Step-by-step explanation:
The average rate of change of a function on the interval [a, b] is given by ...
rate of change = (f(b) -f(a))/(b -a)
On the interval [7, 9], the average rate of change is ...
(5760 -1920)/(9 -7) = 3840/2 = 1920
On the interval [4, 6], the average rate of change is ...
(945 -105)/(6 -4) = 840/2 = 420
The rate of change on the first interval is greater by ...
1920 -420 = 1500
Answer:
1.4
Step-by-step explanation:
12x+3x=15+6
15x=21
X=21/15
X=7/5 or 1.4
