karolmolina49
16.03.2020 •
Mathematics
3. A yield sign is an equilateral triangle
with sides 30 in. long. By arranging the
triangles as shown, the manufacturer
can use the sheet of aluminum to
make 10 yield signs. How much
aluminum is left over when yield
signs are made?
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Ответ:
a = -2
Step-by-step explanation:
f(x)=ax+b
f(2)=1
f(-3)=11
f(2) = 1 means 2a+b =1
f(-3)=11 means -3a + b = 11
Subtracting the two equations
-(-3a +b =11) becomes 3a -b = -11 so we can add
2a+b =1
3a - b = -11
5a = -10
Divide by 5
5a/5 = -10/5
a=-2