1 files changed, 7 insertions, 5 deletions
diff --git a/worksheets/a1_textrain.md b/worksheets/a1_textrain.md
index 6ce1142..7849594 100644
--- a/worksheets/a1_textrain.md
+++ b/worksheets/a1_textrain.md
@@ -42,7 +42,7 @@ In the code block below, write the equation for obtaining the index in the 1D
 array from a (row, column) in the 2D pixels array. Keep in mind you can use
 information from `inputImg` to help you.
 
-```
+```java
 PImage inputImg = loadImage("test.jpg");
 
 // your code should work for any valid values for row and column, we've 
@@ -51,7 +51,7 @@ int row = 2;
 int column = 2;
 
 // write your answer in terms of the row and column defined above
-int index1D = /* --- Fill this in --- */;
+int index1D = row * inputImg.width + column;
 ```
 
 
@@ -73,8 +73,10 @@ final int threshold = 128;
 
 // Returns: thresholded color (black or white)
 color thresholdPixel(color inputPixel) {
-
-  /* --- Fill this in --- */
-
+  if blue(inputPixel) < threshold {
+    return color(0);
+  } else {
+    return color(255);
+  }
 }
 ```