Answer:
Step-by-step explanation:
shirt = x, pants: y
Katie equation: 3x + 2y = 80, Erin equation: 3x + 4y = 116
3x + 2y = 80
3x = 80 - 2y
x = 80/3 - 2y/3
3(80/3 - 2y/3) + 4y = 116
80 - 2y + 4y = 116
80 + 2y + 116
2y = 36
y = 18, pants cost $18
3x + 4(18) = 116
3x + 72 = 116
3x = 44
x = 14.66... (66 is repeating), shirts cost $14.66
check work:
Katie: 3(14.66) + 2(18) = 79.98 which is roughly 80.
Half-life = elapsed time * log(2) / log (bgng amt / ending amt)
half-life = (5 *
<span>
<span>
<span>
0.3010</span></span></span>3) / log (1/.6)
half-life = (5 *
<span>
<span>
0.3010</span></span>3) / log (1/.6)
<span>half-life = 1.505 / </span>
<span>
<span>
<span>
0.221848750
</span>
</span>
</span>
half-life =
<span>
<span>
<span>
6.785 days
Location for formulas & calculator
http://www.1728.org/halflife.htm
</span></span></span>
I tried calculating the problem but couldn't seem to find an answer. I checked on my graphics calculator and on the computer and they provide a "No Solution" answer. The steps shown above lead to a dead end in the calculation.
A) The two factors of the expression are those expressions that are on either side of the (implied) multiplication symbol. They are ...
• 4
• (8 +3x)
B) The first factor (4) consists of one (1) term, "4".
The second factor (8 +3x) consists of two (2) terms, "8" and "3x".
C) The coefficient of x in the second factor is 3.
The coefficient of x in the overall expression is 4*3 = 12.
