zen the20,1.A water tank is being filled by pumps at a constant rate. The volume of water in the tank V, in gallons, isgiven by the equation:v(t) = 65t + 280, where t is the time, in minutes, the pump has been on(a) At what rate, in gallons per minute, is the (b) How many gallons of water were in the tankwater being pumped into the tank?when the pumps were turned on?Ult=65 1280v101=6510) +250=280rate is 65wakers of gallontank had 280 gallons.(c) What is the volume in the tank after two hours (d) The pumps will turn off when the volume inof the pumps running?the tank hits 10,000 gallons. To the nearestminute, after how long does this happen?edict

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general 10 months ago 7174

Zacharias is using the quadratic formula to solve the equation 0 = –2x2 + 5x – 3. He begins by substituting as shown.Quadratic formula: x = StartFraction negative b plus or minus StartRoot b squared minus 4 a c EndRoot Over 2 a EndFractionSubstitution: x = StartFraction negative 5 plus or minus StartRoot 5 squared minus 4(2)(negative 3) EndRoot Over 2(negative 2) EndFractionWhat error did Zacharias make?The –5 should be 5. The 52 should be –52.The 2 in the numerator should be –2.The 2 in the denominator should be –2.

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general 10 months ago 7531