\quad\begin{aligned} &\dfrac{4}{5} +7 -\dfrac{5}{4} \\ =&\dfrac{4}{5} -\dfrac{5}{4}+7&\green{\text{St ep } 1} \\ \\ =&0+7&\blue{\text{Step } 2} \\ \\ =&7&\purple{\text{Step } 3} \\ \\ \end{aligned}
=
=
=


5
4

+7−
4
5


5
4

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+7
0+7
7


Step 1
Step 2
Step 3


Find Becky's mistake

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?