I have worked that on paper
Answer:
A) what did the student do wrong, explain why they are incorrect
B) Demonstrate and explain the correct way to answer the question.
Lauren says that two expressions 3x+4(2x+5) and 6x +5x +5 are equivalent. Simplify the expressions to determine whether or not Lauren is correct. Substitute a value for x to see if she is right.
<u>3x+8x+20 = 6x+5x+5</u>
<u>11x+20 = 11x+5</u>
<u>She is wrong</u>
Students answer: She is correct because both equal 11x +5. I substituted x=2 and got 27 for both
<u>She is wrong because 27 will be the answer for ' 11x+5' only. The correct method should be </u>
<u>x=-15 </u>
Step-by-step explanation:
Answer:
false
Step-by-step explanation:
Answer: 81π
Step-by-step explanation: the slice of the circle is 120 degrees, and to go all the way around the circle is 360. It takes 3 120's to go all the way around the circle. Multiplying 27 times 3 will get you 81.
Answer:
4.7 cm
Step-by-step explanation:
= 7 so side length of the square is 7
7 x 4 = 28 so perimeter is 28cm
28 - 9.3 - 9.3 = 9.4
9.4 / 2 = 4.7 cm
