Since all Calculator commands begin with the prefix `calc-', the x key has been provided as a variant of M-x which automatically types `calc-' for you. Thus, x last-args is short for M-x calc-last-args.
another-calccalccalc-abscalc-abs (vectors)calc-abssqrcalc-alg-evaluatecalc-alg-simplify-modecalc-algebraic-entrycalc-algebraic-modecalc-alt-summationcalc-always-load-extensionscalc-andcalc-apartcalc-applycalc-arccoscalc-arccoshcalc-arcsincalc-arcsinhcalc-arctancalc-arctan2calc-arctanhcalc-argumentcalc-arrange-vectorcalc-assigncalc-auto-recomputecalc-auto-whycalc-autorange-unitscalc-base-unitscalc-bernoulli-numbercalc-bessel-Jcalc-bessel-Ycalc-betacalc-big-languagecalc-bin-simplify-modecalc-breakcalc-break-selectionscalc-break-vectorscalc-build-vectorcalc-business-days-minuscalc-business-days-pluscalc-c-languagecalc-ceilingcalc-center-justifycalc-change-signcalc-choosecalc-cleancalc-clean-numcalc-clear-selectionscalc-clipcalc-cnormcalc-collectcalc-commute-leftcalc-commute-rightcalc-compilecalc-complex-notationcalc-concatcalc-conjcalc-conj-transposecalc-conscalc-convert-percentcalc-convert-temperaturecalc-convert-time-zonescalc-convert-unitscalc-copy-as-killcalc-copy-region-as-killcalc-copy-to-buffercalc-copy-variablecalc-coscalc-coshcalc-crosscalc-curve-fitcalc-datecalc-date-notationcalc-date-partcalc-declare-variablecalc-decrementcalc-default-simplify-modecalc-define-unitcalc-degrees-modecalc-del-selectioncalc-derivativecalc-describe-functioncalc-describe-keycalc-describe-key-brieflycalc-describe-variablecalc-diagcalc-diffcalc-display-stringscalc-dividecalc-dotscalc-double-factorialcalc-editcalc-edit-finishcalc-edit-selectioncalc-edit-user-syntaxcalc-edit-variablecalc-embeddedcalc-embedded-activatecalc-embedded-duplicatecalc-embedded-editcalc-embedded-new-formulacalc-embedded-nextcalc-embedded-previouscalc-embedded-selectcalc-embedded-updatecalc-embedded-wordcalc-enable-selectionscalc-eng-notationcalc-entercalc-enter-selectioncalc-enter-units-tablecalc-eqn-languagecalc-equal-tocalc-erfcalc-euler-numbercalc-eval-numcalc-evaltocalc-evaluatecalc-execute-extended-commandcalc-expcalc-expandcalc-expand-formulacalc-expand-vectorcalc-explain-unitscalc-expm1calc-ext-simplify-modecalc-extended-gcdcalc-extract-unitscalc-factorcalc-factorialcalc-fdivcalc-fin-ddbcalc-fin-fvcalc-fin-irrcalc-fin-npercalc-fin-npvcalc-fin-pmtcalc-fin-pvcalc-fin-ratecalc-fin-slncalc-fin-sydcalc-find-maximumcalc-find-minimumcalc-find-rootcalc-fix-notationcalc-flat-languagecalc-floatcalc-floorcalc-flush-cachescalc-fortran-languagecalc-frac-modecalc-fractioncalc-from-hmscalc-full-helpcalc-full-trail-vectorscalc-full-vectorscalc-gammacalc-gcdcalc-get-modescalc-get-unit-definitioncalc-get-user-defncalc-grab-rectanglecalc-grab-regioncalc-grab-selectioncalc-grab-sum-acrosscalc-grab-sum-downcalc-gradecalc-graph-addcalc-graph-add-3dcalc-graph-bordercalc-graph-clearcalc-graph-commandcalc-graph-deletecalc-graph-devicecalc-graph-displaycalc-graph-fastcalc-graph-fast-3dcalc-graph-geometrycalc-graph-gridcalc-graph-headercalc-graph-hidecalc-graph-jugglecalc-graph-keycalc-graph-killcalc-graph-line-stylecalc-graph-log-xcalc-graph-log-ycalc-graph-log-zcalc-graph-namecalc-graph-num-pointscalc-graph-outputcalc-graph-plotcalc-graph-point-stylecalc-graph-printcalc-graph-quitcalc-graph-range-xcalc-graph-range-ycalc-graph-range-zcalc-graph-title-xcalc-graph-title-ycalc-graph-title-zcalc-graph-view-commandscalc-graph-view-trailcalc-graph-zero-xcalc-graph-zero-ycalc-greater-equalcalc-greater-thancalc-group-charcalc-group-digitscalc-headcalc-helpcalc-histogramcalc-hms-modecalc-hms-notationcalc-hyperboliccalc-hypotcalc-i-notationcalc-identcalc-idivcalc-ilogcalc-imcalc-imaginarycalc-in-setcalc-inc-betacalc-inc-gammacalc-inc-monthcalc-incrementcalc-indexcalc-infinite-modecalc-infocalc-info-summarycalc-inner-productcalc-insert-variablescalc-integralcalc-invcalc-inv (matrices)calc-inversecalc-isqrtcalc-j-notationcalc-juliancalc-kbd-elsecalc-kbd-else-ifcalc-kbd-end-forcalc-kbd-end-ifcalc-kbd-end-loopcalc-kbd-end-repeatcalc-kbd-forcalc-kbd-ifcalc-kbd-loopcalc-kbd-popcalc-kbd-pushcalc-kbd-querycalc-kbd-repeatcalc-kbd-reportcalc-keep-argscalc-keypadcalc-killcalc-kill-regioncalc-last-argscalc-lcmcalc-leading-zeroscalc-left-justifycalc-left-labelcalc-less-equalcalc-less-recursion-depthcalc-less-thancalc-letcalc-line-breakingcalc-line-numberingcalc-lncalc-lnp1calc-load-everythingcalc-logcalc-log10calc-logical-andcalc-logical-ifcalc-logical-notcalc-logical-orcalc-lshift-arithcalc-lshift-binarycalc-ltptcalc-mant-partcalc-mapcalc-map-equationcalc-maple-languagecalc-mask-vectorcalc-matchcalc-mathematica-languagecalc-matrix-bracketscalc-matrix-center-justifycalc-matrix-left-justifycalc-matrix-modecalc-matrix-right-justifycalc-maxcalc-mcolcalc-mdetcalc-mincalc-minuscalc-mludcalc-modcalc-modecalc-mode-record-modecalc-moebiuscalc-more-recursion-depthcalc-mrowcalc-mtracecalc-new-monthcalc-new-weekcalc-new-yearcalc-next-primecalc-no-simplify-modecalc-normal-languagecalc-normal-notationcalc-normalize-ratcalc-notcalc-not-equal-tocalc-nowcalc-num-integralcalc-num-prefixcalc-num-simplify-modecalc-orcalc-other-windowcalc-outer-productcalc-overcalc-over-notationcalc-packcalc-pack-bitscalc-pascal-languagecalc-percentcalc-percent-changecalc-permcalc-permanent-unitscalc-permanent-variablecalc-picalc-pluscalc-point-charcalc-polarcalc-polar-modecalc-poly-divcalc-poly-div-remcalc-poly-gcdcalc-poly-interpcalc-poly-remcalc-poly-rootscalc-popcalc-pop-abovecalc-powercalc-precisioncalc-prev-primecalc-prime-factorscalc-prime-testcalc-productcalc-quick-unitscalc-quitcalc-radians-modecalc-radixcalc-randomcalc-random-againcalc-recalc-realigncalc-recallcalc-redocalc-reducecalc-refreshcalc-refresh-topcalc-remove-duplicatescalc-remove-equalcalc-remove-unitscalc-resetcalc-reverse-vectorcalc-rewritecalc-rewrite-selectioncalc-right-justifycalc-right-labelcalc-rnormcalc-roll-downcalc-roll-upcalc-rotate-binarycalc-roundcalc-rrandomcalc-rshift-arithcalc-rshift-binarycalc-save-modescalc-scale-floatcalc-sci-notationcalc-scroll-downcalc-scroll-leftcalc-scroll-rightcalc-scroll-upcalc-sel-add-both-sidescalc-sel-commutecalc-sel-distributecalc-sel-div-both-sidescalc-sel-evaluatecalc-sel-expand-formulacalc-sel-invertcalc-sel-isolatecalc-sel-jump-equalscalc-sel-mergecalc-sel-mult-both-sidescalc-sel-negatecalc-sel-sub-both-sidescalc-sel-unpackcalc-select-additionalcalc-select-herecalc-select-here-maybecalc-select-lesscalc-select-morecalc-select-nextcalc-select-oncecalc-select-once-maybecalc-select-partcalc-select-previouscalc-set-cardinalitycalc-set-complementcalc-set-differencecalc-set-enumeratecalc-set-floorcalc-set-intersectcalc-set-spancalc-set-unioncalc-set-xorcalc-settings-file-namecalc-shift-prefixcalc-show-plaincalc-show-selectionscalc-shufflecalc-signcalc-simplifycalc-simplify-extendedcalc-simplify-unitscalc-sincalc-sincoscalc-sinhcalc-solve-forcalc-sortcalc-split-manualcalc-split-summarycalc-sqrtcalc-stirling-numbercalc-storecalc-store-AlgSimpRulescalc-store-concatcalc-store-Declscalc-store-decrcalc-store-divcalc-store-EvalRulescalc-store-exchangecalc-store-ExtSimpRulescalc-store-FitRulescalc-store-GenCountcalc-store-Holidayscalc-store-incrcalc-store-IntegLimitcalc-store-intocalc-store-invcalc-store-LineStylescalc-store-mapcalc-store-minuscalc-store-negcalc-store-PlotRejectscalc-store-pluscalc-store-PointStylescalc-store-powercalc-store-timescalc-store-TimeZonecalc-store-Unitscalc-subscriptcalc-substitutecalc-subvectorcalc-summationcalc-symbolic-modecalc-tabulatecalc-tailcalc-tancalc-tanhcalc-taylorcalc-tex-languagecalc-timecalc-time-zonecalc-timescalc-timingcalc-to-degreescalc-to-hmscalc-to-radianscalc-total-algebraic-modecalc-totientcalc-trail-backwardcalc-trail-displaycalc-trail-firstcalc-trail-forwardcalc-trail-herecalc-trail-incalc-trail-isearch-backwardcalc-trail-isearch-forwardcalc-trail-killcalc-trail-lastcalc-trail-markercalc-trail-nextcalc-trail-outcalc-trail-previouscalc-trail-scroll-leftcalc-trail-scroll-rightcalc-trail-yankcalc-transposecalc-trunccalc-truncate-downcalc-truncate-stackcalc-truncate-upcalc-tutorialcalc-undefine-unitcalc-undocalc-unformatted-languagecalc-units-simplify-modecalc-unix-timecalc-unpackcalc-unpack-bitscalc-unselectcalc-unstorecalc-user-definecalc-user-define-compositioncalc-user-define-editcalc-user-define-formulacalc-user-define-invocationcalc-user-define-kbd-macrocalc-user-define-permanentcalc-user-invocationcalc-user-undefinecalc-utpbcalc-utpccalc-utpfcalc-utpncalc-utppcalc-vector-bracescalc-vector-bracketscalc-vector-commascalc-vector-correlationcalc-vector-countcalc-vector-covariancecalc-vector-findcalc-vector-geometric-meancalc-vector-harmonic-meancalc-vector-maxcalc-vector-meancalc-vector-mean-errorcalc-vector-mediancalc-vector-mincalc-vector-parenscalc-vector-pop-covariancecalc-vector-pop-sdevcalc-vector-pop-variancecalc-vector-prodcalc-vector-sdevcalc-vector-sumcalc-vector-variancecalc-versioncalc-view-units-tablecalc-vlengthcalc-whycalc-word-sizecalc-workingcalc-xorcalc-xpon-partcalc-yankdescribe-bindingsfull-calcfull-calc-keypadquick-calcread-kbd-macro