Because it gives you a number that is close to the answer and if it is close to your number like for instance, the actual answer is 10 then if you get 5 as your estimate that's close.
Step-by-step explanation:
a=2,b=-4,c=7,d=-3
b-a(cd+b)+a=-4-2(7×-3)+2
=-6(-21)+2
=126+2
=128
<em>Keep</em><em> </em><em>smiling</em><em> </em><em>and</em><em> </em><em>h</em><em>ope</em><em> </em><em>u</em><em> </em><em>are</em><em> </em><em>satisfied </em><em>with</em><em> </em><em>my</em><em> </em><em>answer</em><em>.</em><em>Have</em><em> </em><em>a</em><em> </em><em>nice</em><em> </em><em>day</em><em>:</em><em>)</em>
Answer:
Step-by-step explanation:
Given:
Volume of water in p = 65 gallons
Volume of water in q = 63.5 gallons
Initially,
Vip = 65 gallon
Viq = 63.5 gallon
Volumetric rate, v = volume/time
At the time both tanks will be filled,
Vfp = Vfq
Final volume, Vf = Vi + v×t
65 - vt = 63.5 + vt
65 - Kt = 63.5 + Mt
Calculating t,
65 - 63.5 = Mt + Kt
1.5 = (M + K) × t
Time, t = 1.5/(M + K) minutes