One number is 4 more than another, and their sum is 60. what is the smaller number?

if x = the larger number and y = the smaller number, then which of the following systems could be used to solve the problem?

x + y = 60 and -x + y = 4
x + y = 60 and x - y = 4
x + y = 60 and x + y = 4

Find the area of a trapezoid with a height of 23, base 1 of 10 and base 2 of 18

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

2x minus y equals 6, x plus y equals negative 3