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1) Résoudre Pb2) Calcul réfléchit3) Automatisation4) Procédures posées5) Nouvelle résolution de pb = énoncé plus difficile

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The equations 𝑥 + 𝑦 = 3 and −5𝑥 − 5𝑦 = −15 are graphed in the xy-plane. Which of the following must be true of the graphs of the two equations?A. Theslopeofthegraphof 𝑥+𝑦=3 is1andtheslopeofthegraphof−5𝑥−5𝑦=−15 is−1.B. The graphs of the two equations are perpendicular lines.C. The y-intercept of the graph of −5𝑥 − 5𝑦 = −15 is −15.D. The graphs of the two equations are the same line.

According to Bernoulli's equation below, the product of the area, Ā, of a cross-section of a hose at a particular point and the velocity, V1, of water traveling through the hose at that point will be equal to the product of the area, Á, of a second cross-section of the same hose at a second point and the velocity, V2, of water traveling through the hose at the second point.𝐴!𝑉! = 𝐴!𝑉!If someone covers ! of the opening of a hose, how will the velocity of the water comingout of the hose change?A. The velocity of the water through the partially covered opening will be ! of thevelocity through the full opening.B. The velocity of the water through the partially covered opening will be ! of thevelocity through the full opening.C. The velocity of the water through the partially covered opening will be ! of thevelocity through the full opening.D. The velocity of the water through the partially covered opening will be 4 timesthe velocity through the full opening.

Currently, a local newspaper company sells print subscriptions for $9.30 a month and has2400 subscribers. Based on a survey conducted, they expect to lose 20 subscribers for each $0.10 increase from the current monthly subscription price. What should the newspaper company charge for a monthly subscription in order to maximize the income from the print newspaper subscriptions?A. $1.35B. $9.30 C. $10.65 D. $22.80

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