Mathematics, 22.01.2020 19:31, def88
\begin{aligned} 7.5+k& =10 7.5+k-7.5& =10-7.5& \green{\text{step } 1} k& =2.5& \blue{\text{step } 2} \end{aligned}
7.5+k
7.5+k−7.5
k
=10
=10−7.5
=2.5
step 1
step 2
find annie's mistake.
choose 1
choose 1
(choice a)
a
\green{\text{step }1}step 1start color #28ae7b, start text, s, t, e, p, space, end text, 1, end color #28ae7b
(choice b)
b
\blue{\text{step }2}step 2start color #6495ed, start text, s, t, e, p, space, end text, 2, end color #6495ed
(choice c)
c
annie did not make a mistake.
Answers: 1
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\begin{aligned} 7.5+k& =10 7.5+k-7.5& =10-7.5& \green{\text{step } 1} k& =2.5& \...
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