Interpreting Capacitor Markings
These sound like old monolithic ceramic caps I used to use in 70's and 80's. 1st one could be for low RF and N750 often meant neg -750 ppm/'C used to some temperature compensation with old Oscillator designs although P150 was more useful and NP"zero" but said as NP"oh"= NP0 aka C0G were best with low ESR and &lt;50ppm/'C (lowest tempco range).

I agree with Andy use 2,3 as general purpose decoupling caps, in case you are desperate. Ceramic caps now are usually multi-layer and not monolithic. 

MLCC caps became replacements for Kemet family of monolithic caps. The tiny blue one may be MLCC type. Multi-Layer Ceramic Capacitor,