Cos38 = 7,8/x
X= 7,8/cos38
= 9,90
Answer:
b
Step-by-step explanation:
just took test
Answer:
18
Step-by-step explanation:
note when dividing the denominator and numerators changes position so when it changes it will be 3×6=18
This is known as Einstein's proof, not because he was the first to come up with it, but because he came up with it as a 15 year old boy.
Here the problem is justification step 2. The written equation
BC ÷ DC = BC ÷ AC
is incorrect, and wouldn't get us our statement 2, which is correct.
For similar triangles we have to carefully pair the corresponding parts to get our ratios right:
ABC ~ BDC means AB:BD = BC:DC = AC:BC so BC/DC=AC/BC.
Justification 2 has the final division upside down.
