Use PEMDAS:
Parentheses
Exponents
Multiply and Divide from left to right.
Add and Subtract from left to right.
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Evaluate the exponents.
2^2+4^2/2^2
Divide from left to right.
4 + 16/4
Add from left to right.
4 + 4
Solution.
8
Answer:
Perimeter of △BDC=Sum of all the sides=BD+DC+CB=15+15+15=45
Step-by-step explanation:
Given ΔABC is an isosceles triangle, thus, AB=BC=x and AC=12,
perimeter of △ABC is=42
⇒x+x+12=42
⇒2x=30
⇒x=15
Thus, AB=BC=15
Now, △BDC is an equilateral triangle therefore BD=DC=BC=x
Since, x=15, therefore BD=DC=BC=15
Now, Perimeter of △BDC=Sum of all the sides=BD+DC+CB=15+15+15=45
Is the arrow the length of the rotation? 90 degrees? if so, the second picture is, with the star at the highest point of the other pictures.
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Set up the equation of two ratios:
3 racks 36 racks
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15 min x
Solve this for x: 3x =540; x = 180 minutes, or 3 hours
