Part a derek has $80 to spend on used books. hardcover books cost $10 each, and paperbacks cost $20 each. complete the equation which determines the number x of hardcover books and the number y of paperback books he can buy. x + y = part b for the situation in part a, which of the following represent possible combinations of books that derek can buy? select all that apply. a. (0, 4) b. (2, 3) c. (7, 2) d. (8, 0)

Options A , B and D are fulfilling the requirements.

Step-by-step explanation:

Derek has $80 to spend on used books. Hardcover books cost $10 each, and paperbacks cost $20 each.

Let x be the number of hardcover books and y be the number of paperback books Derek can buy.

The total books he can buy are

A.  (0, 4) substituting x as 0 and y as 4

= 80

B.  (2, 3) substituting x as 2 and y as 3

=

= 80

C.  (7, 2)  substituting x as 7 and y as 2

=

= 110

D.  (8, 0)  substituting x as 8 and y as 0

= 80

Hence, options A , B and D are fulfilling the requirements.

use formula for the circle a=3.14

step-by-step explanation:

∠lno ≅ ∠lnm

∠oln ≅ ∠mln

step-by-step explanation:

given   that triangle lno is congruent to triangle lnm.

we have to fill up the blanks in the given question.

according to above order of congruency   kept in mind we can say that

∠lno ≅ ∠lnm

∠oln ≅ ∠mln

ln ≅ ln due to common in both.

hence, by sas congruency,

the side angle side rule   states that if two sides and the included angle of one triangle are congruent to another triangle, then these two triangles are congruent.