Answer:
X = 24
Step-by-step explanation:
Add 9 To Both Sides
X - 9 + 9 = 15 + 9
Simplify
Best Of Luck,
- I.A. -
The answer is B. 24.
A isn't going to work, since 6 is less than 9. It'd give you a negative number.
D won't work, either, it'd give you -15. Again, you'd get a negative number.
C won't work for the same reasons as last time, it'd give you a negative number.
B gives you the exact number we're looking for, and it's a positive number.
0.85 pages per minute
8 1/2 ÷ 10 = 8.5 ÷ 10 = 0.85
2.9 years
Given that :
Half-life t1/2 = 9 years
Initial mass = I = 70 grams
A = final mass = 56 grams
t = time taken to reach final amount
Using the exponential half life relation :
A = I(0.5)^t/t1/2
56 = 70(0.5)^t/9
56/70 = 0.5^t/9
0.8 = 0.5^t/9
Log 0.8 = log 0.5^t/9
−0.096910 = −0.301029 * t/9
t/9 = 0.096910 / 0.301029
t/9 = 0.3219291
t = 0.3219291 * 9
t = 2.8973619
t = 2.9 years
1.0892*10²
{-6 , 7 , 1} {9 , -3 , -4} {5 , -8 , 4} --- 2, 2, 1
Number 1: {-6 , 7 , 1} {9 , -3 , -4} {5 , -8 , 4} --- 2, 2, 1
Number 2: {-6 , -3 , 9} {4 , 7 , -8} {5 , 1 , -4} --- 0, 3, 2
Number 2: {-4 , 5 , 1} {7 , 4 , -8} {-6 , -3 , 9} --- 2, 3, 0
use the formula if things get to difficult
