Tisha tried to evaluate an expression. Here is her work: 490÷729–23 = 490÷499–23 Step 1 = 109–23 Step 2 = 90–23 Step 3 = 883 Ste
1 answer:
Answer:
No, she made mistake from step 3, going to step 4
Step-by-step explanation:
See attachment for complete expression and Tisha's steps
Required
Is she correct?
The steps up to step 3 is correct.
However, going to step 4; she made a mistake
Her expression is:
Step 3:
The correct step is to multiply 2 by 3 (using BODMAS)
This will give:
But instead she evaluated the subtraction first, which is incorrect.
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Answer:
one side =
Step-by-step explanation:
if you draw an octagon on a piece of paper, you can draw a square around it, you should be able to see a diagram of this attached, ignore the 6.
Let's say TP = a
since it's a regular octagon, TP = HT
and using the Pythagoras Theorem, we know a² + b² = c² and thus:
√(AT² + HA²) = HT
and since AT = HA which we will call x, the equation becomes:
√(2x²) = HT = a
rearrange the equation to solve for x and you get:
2x² = a²
x² =
x =
which, if you rationalise the denominator, you get:
x =
