Are 12:21 and 7:16 equivalent

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Consider the graph of the exponential function y=3(2)×

Given abcd ac=38 and ae=3x+4 find the value of x