9x^2-42x+49... Sorry if I'm too late!
Answer:
200000000000
Step-by-step explanation:
Mistake:
Step 2
Instead of multiplying it should divide:
(5a^2/ 9b^2) / (3a / b^2 a)
(5a^2 / 9b^2) * (b^2a / 3a)
5a^2b^2 / 27b^2a
b^2 / b^2 = 1
a^2 / a = a
5a / 27
Answer:
$a decreased by 25% and $1.2a decreased by 40%
$a decreased by 25% = 0.75a
1.2a decreased by 40% = 0.6*1.2a = 0.72a
2) $b increased by 250% and $2b increased by 50%
$b increased by 250% = 2.5b
$2b increased by 50% = 1.5*2b = 3b
Answer:
r1 =6
r2 =8
t = ?
[(1/r1) * t] + [(1/r2)*t] = 1
t/6 + t/8 = 1
multiply by common denominator... 24
24 (t/6 + t/8 = 1)
4t + 3t =24
7t = 24
t = 24/7 = 3.4hrs
