The answer is E i believe!
Okay. To solve this problem, all we have to do is find the amount of change by subtraction. 50 - 30 = 20. You find the percent of change by writing out a proportion. Do change/original = x/100. You set it up like this to find the percentage. With the numbers plugged in, it’s 20/30 = x/100. Cross multiply in order to get 2,000 = 30x. Now, divide each side by 30 to isolate the “x”. 2,000/ 30 is 66.6666 and the 6ms repeating or 67 when rounded to the nearest whole number. The percent markup is approx. 67%.
Answer:
a. x + 4 = 12; x = 8
b. 2x + 4 = 12; x = 4
Step-by-step explanation:
a. for x = 8; let unknown be k
k + 4 = 12
k = 12 - 4 = 8
k/x = 8/8 = 1 which is the coefficient of x
therefore x + 4 = 12 when x = 8 is correct
b. for x = 4
k + 4 = 12
k = 8
k/x = 8/4 = 2 which is the coefficient of x
therefore 2x + 4 = 12 when x = 4 is correct
