Abuilding 84 ft high casts a 231-ft shadow. sarah casts a 11-ft shadow. the triangle formed by the building and its shadow is similar to the triangle formed by sarah and her shadow. how tall is sarah?
a) 4 feet
b) 3 feet
c) 6 feet
d) 5 feet

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm