American female voiceover artist

I'm looking for american female voice-over for math animations we create. We have around 30 videos (each less than a 1 minute long). The animations have text display - you would essentially synch up your voice with the text to improve the overall effect and engagement value of the animation. The target audience is middle school children (6th grade) and the voice should be slow enough so student whose first language is not english can follow and at the same time sound like normal american english. The voiceover we are looking for is essentially to go with the text display shown in these videos. If you are interested, send me a sample of your voice. If we are able to build a working relationship with you, we will have more such animations in future to do voiceover.