Answer:
12cm
Step-by-step explanation:
4 3/5 ≈ 5
1 1/5 ≈ 1
(4 3/5) +(1 1/5)
≈ 5 +1
≈ 6 . . . . . . . . . . . the estimated sum rounded to whole numbers
_____
Additional information:
As a refinement to your estimate, you can estimate the error. The first number is 2/5 less than 5. The second number is 1/5 more than 1, so the errors add up to
.. (2/5) +(-1/5) = 1/5
That is, your "estimate" of 6 is actually too high by 1/5. You can refine that estimated value by subtracting 1/5. 5 4/5 would be a closer "estimate."
Answer:
Step-by-step explanation:
= 10 square inches
Area of the place mat = 42 * 10 = 420 square inches
Area of each triangle = 10 square inches
Area of the place mat = 420 square inches
Answer:
3x+11 = 65, so x will equal 18
Answer 18 2/7
Explanation: First put the fractions in improper form 5 5/7 is 40/7 and 3 1/5 is 16/5 then multiply which equals 640/35 then divide that by 5 which equals 128/7 then do 128 divided by 7 and take the whole number which is 18, do 18 times 7 which equals 126 so final answer is 18 2/7