4. A jacket costing $ 120 is discounted 20%. After a week, the jacket is discounted another 20% and is sold. What expression below can be used to calculate the cost for which the jacket was sold?

A. (120)(0.40)

B. 120-120(0.40)

C. 120-(120)(.20)-[120-(0.20) (120)](0.20)

D. 120-(120)(0.40)-[120-(120) (0.40)]

In this problem you will calculate the area under f(z)-4x on the interval 15,101 by using right endpoint approximations: 1. The interval 15,101 is divided into n equal subdivisions of length Δ What is Δ.zr_ 2. The right-hand endpoint of the jth subinterval is denoted what is (in terms of j and N) 3. Using these choices for and dir, the definition tells us that Area lim what is f(r;)Ar? -(in terms of j and N) 4. Express Σ f(引Ar in closed form. _ - -(Your answer will be in terms of N and j-1 not j-) 5, Finally, complete the problem by taking the limit as N → oo of the expression that you found in the previous part rea= lim

(1 point) In this problem you will calculate | x2 + 5 dx by using the formal definition of the definite integral: ['sor as- en (įrenad f(x) dx = lim n–00 *)Ax|| _k=1 (a) The interval [0, 2] is divided into n equal subintervals of length Ax. What is Ax (in terms of n)? Ax = 2/n (b) The right-hand endpoint of the kth subinterval is denoted x. What is x (in terms of k and n)? x¢ = (0+2k/n (C) Using these choices for x* and Ax, the definition tells us that ('e es deu em (grammar). x2 +5 dx = lim n+00 f(x)dx : What is f(x; )Ax (in terms of k and n)? f(; )ax = (0+2k/ny^2+5)2/m (d) Express Ef(x)Ax in closed form. (Your answer will be in terms of n.) k=1 n Ëso; Jar - ( (e) Finally, complete the problem by taking the limit as n + w of the expression that you found in the previous part. L'ens de (2,maj - ma

In this problem you will calculate the area under (x) 4r on the interval [5,10] by using right endpoint approximations: 1. The interval 15,101 is divided into n equal subdivisions of length Δ". What is Ar? right-hand endpoint of the jth subinterval is denoted z. ,.㠡㠡㠡㠡㠡㠡 㠡㠡㠡㠡㠡㠡㠡㠡㠡㠡㠡㠡 (in terms of, and N) 2. The What is rj? 3. Using these choices for and Ar, the definition tells us that Arealim What is f㈜Ar?- (in terms of j and N) 4. Express Σ f(x)as in closed form. _ _ _ (Your answer will be in terns of N and not j.) Finally, complete the problemi by taking the limit as N → oo of the expression that you found in the previous part. 5 N →00