I have a notebook without a scoll wheel. What is the keyboard command for zooming in the browser? I wanto be able to zoom to 100% on a page that is blown up to 150%.
Typically ctrl + scroll wheel would work, but in your case as explained on Lifehacker:
In order to zoom in, you just press control (Windows) or command (Mac) and the + key. (Technically you're pressing the = key because you'd need to press shift to make a plus, but thinking of it as the + key makes more sense since it's zooming you in.) To zoom out, press control/command -, and press control/command 0 to set things back to normal.
Not a shortcut via keyboard but still may solve your issue:
Some mousepad drivers allow you to zoom via gesture (e.g. "un-pinching"). Go to Settings > Hardware and Sound > Mouse.
If you have a Synaptics touchpad, there will be a "Device Settings" tab. The entry which mentions the touchpad should be highlighted. Then, click on "Settings"
Another window should pop up. The settings of the so-called "pinch zoom" should be somewhere.
If you don't have such a touchpad, you have to look for similar settings in the mouse properties window or somewhere else in the hardware settings.