A textbook store sold a combined total of 312 biology and physics textbooks in a week. The number of physics textbooks sold was 54 less than the number of biology textbooks sold. How many textbooks of each type were sold

129 physics textbooks, 183 biology textbooks

Step-by-step explanation:

Let x be the number of biology textbooks and x-54 the numbers of physics textbooks.

So:

x+(x-54)=312

2x-54=312

2x=366

x=183

So 129 physics textbooks and 183 biology textbooks were sold.

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of

step-by-step explanation: