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Solve me mobiles

September 20, 2019

Grade 9s did a quiz today and after sending emails and watering beans, we looked at solve me mobiles. There are some pretty intense problem solving tasks!

Distance and circles are all just pythagorean theorem!

September 20, 2019

Today we looked at the distance between 2 points. We had an easy time if the segments were horizontal or vertical, but stumbled when we had to calculate the distance of a segment that is diagonal. Pythagorean theorem helped us out!

We also looked at the group of points that are a fixed distance from the origin (0,0). This example is a lot of points that are 5 units from the origin. It makes a circle!

We now know the equation of a circle is x^2+y^2=r^2.

Do people with longer feet have longer forearms?

September 19, 2019

After watering and measuring our plants…

…we looked at correlation in scatter plots again. We started with this image as inspiration.

We wondered if feet matched up with forearm length.

We measured, and put out table of values on desmos.

We noticed the trend was positive, weak, linear and partial.

We got desmos to do a linear regression for us, and then we estimated the forearm length of someone with 15cm feet to be 17cm.

Just for fun we used the equation that desmos gave us, and we calculated it too, using BEDMAS.

Grade 10s have a test tomorrow!

September 18, 2019

Good luck grade 10s as you prepare for your test.

Today we were busy working on chapter review, graphing lines, solving problems, and asking lots of questions to clarify last minute concerns from chapter 1.

Learning from our TV dimensions graph

September 18, 2019

We used our desmos graph and added a line of best fit (by typing y=mx+b) and adjusted it with the sliders.

We noticed that “m” changes the slope (steepness) of the line, or makes it positive or negative. We noticed “b” changes the place where the line crosses the vertical axis.

We are practicing lots of our vocabulary as we look at these graphs.

We also got desmos to do a regression for us (to make the best line of best fit). We need to type in y2~mx2+b this time. The ~ tells the program that we want a regression, and the little 2s after the x and y link to the headings of the table of values we used.

We looked at interpolating and extrapolating, and making a rate triangle to approximate “m”.

We have some homework for tonight that uses desmos and analysis of graphs.

Nos données de Télévision

September 17, 2019

Voici le graphique que nous avons fait en utilisant les dimensions horizontales et dimensions verticales de nos télévisions.  Ici c’est le format de desmos.desmos-graph (1)

et ici c’est le format de google sheets.  Avec les deux formats nous pouvons faire les droites/courbes ajustées.

Nous allons pratiquer comment faire interpolation et extrapolation en utilisant les deux graphiques.  Une télévision avec la dimension verticale de 200cm aura une dimension horizontale de ___cm?  Une télévision avec la dimension horizontale de 80po aura une dimension verticale de ____po?

Beans!

September 16, 2019

Grade 9s planted their beans today, but first we calculated the percentage that germinated. Some groups had some stinky rotting beans too.

We put them in cups of soil and made sure that the roots were covered.

We gave each bean a name, and labelled them all so we know what type of bean is growing and we can track their growth rate. Some plants are already above the soil!

Our beans are on the windowsill, ready to soak up the sun.

Grade 9s are at the park tomorrow for their fun day.