Question

An oil drilling company is drilling a hole. The elevation of the bottom of the hole changes by feet each day. After a certain number of days, the bottom of the hole is at an elevation of feet. Which equation can be used to find x, the number of days they drilled?

Answer 1

Answer:

option.D

Step-by-step explanation:

• each day it changes by $-73\frac{1}{4}$

• so for two days , the elevation becomes  $-73\frac{1}{4}$ +  $-73\frac{1}{4}$

• for 3 days :  $-73\frac{1}{4}$ +  $-73\frac{1}{4}$ +  $-73\frac{1}{4}$

• so, for n days,  $-73\frac{1}{4}$ + ........ n times

=  n*$-73\frac{1}{4}$

• therefore, for x days, elevation = x*$-73\frac{1}{4}$

• as it is given that after certain days this elevation has reached $-366\frac{1}{4}$

• so, x*$-73\frac{1}{4}$ = $-366\frac{1}{4}$