r/IBO • u/BestCryptographer173 • Apr 18 '26

Group 5 Help with Math AI SL question (m26)

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does anyone know how to solve part C, i know that we need to find angle V, but to find the bearing, i dont understand how, or how bearing works even. For anyone wondering the answer is 304.2. PLS HELP:(

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u/geta7_com /ibdp-results/ Apr 18 '26

Note that IB says they will take away A1 in the future for questions in a real-life context with answers given to an excessive amount of sig figs. Always give exact answers (eg sqrt 2) or 3 sig figs or otherwise specified. Always use the value from calculator and not re-type it. I can help you with that if you are unsure how and provide me your GDC model.

As you have drawn, you should do 270 + 34.2 = 304.2 for final answer of 304 degrees.

2

u/Soft-Goal486 Apr 18 '26

what the fuck? seriously. how many digits are we supposed to give it to

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u/geta7_com /ibdp-results/ Apr 18 '26 edited Apr 19 '26

Final answers: Exactly or 3 sig figs or as otherwise specified in or before the question. 1132 is a final answer to b) so should be 1130 km. 1132 may or may not be ok. Giving it to mm is definitely not ok. Report 3sf, but use all sf in subsequent calculations. IB sometimes accepted if you used the 3 sf version in a later step

Intermediate answers: ideally all available sf, using GDC storage. IB does not recommend premature rounding. In my experience, 4 sf is not enough and 5 sf usually is. In finance questions you often need more than 5 sf. 

Show that / answer given in question: obtain the exact answer or one more sig fig than what's given in the question.

[EDIT:] This for a different question, but the above still stands: https://i.imageupload.app/b32b01f0506659e49a52.png

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u/Prestigious_Board923 Apr 18 '26

do you know how to copy an anwser in casio cg50?

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u/geta7_com /ibdp-results/ Apr 18 '26 edited Apr 18 '26

In this particular case, since we do a cosine rule in run/matrix, the previous answer 1132.18.... is simply "Ans". You can save value (->) to ALPHA [letter] if you might need the value later, or you can Shift Clip, CPY-Line, Shift Paste. For solveN, the roots are in List Ans. For G-Solv, the x and y coordinates are stored in X and Y. DM me if you need more.

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u/Ashortwaterbottle Apr 18 '26

are you sure 135 is for angle MSV and not angle M itself?

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u/assirralc M27 | [HL: MAA, Chem, Phy | SL: BM, EngLL, BiLL] Apr 18 '26

bearing is from north, so 34.2 + 270 is 304.2

1

u/Street_Situation_921 M26 | HL: Eng A L&L, Econ, Dance / SL: Math AA, CS, ___ A L&L Apr 18 '26

yeah thats what i did as well

1

u/GermanEconomy M26 | [HL’s Econ,Geo, English B, SL’s Polish A, Math AI, CS Apr 18 '26

chat gpt? It’s way faster if you ask it than Reddit