18. all you have to to is take twenty and subtract 2 from it and you get x
Step-by-step explanation:
area of trapezium = 15× 12 + 1/2× 12× 5
= 180 + 30 = 210
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Answer:
- single term
- sum of 4 terms, some of which can be expanded further
Step-by-step explanation:
1. 3x
This is a single term with one variable of the first degree.
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2. 4x + 9(2x + 1) x² + 6(-2x + 1) - 3(7 + x?)
This is a sum of 4 terms, some of which can be expanded:
- 4x
- 9(2x+1)x^2 ⇒ 18x^3 +9x^2
- 6(-2x +1) ⇒ -12x +6
- -3(7+x?) ⇒ -3x? -21
The expression can be simplified by combining like terms.
If she’s already 1 m down and dives 0.5 m down you can write an expression like this: 1 + 0.5. This, she is now 1.5 m below sea level.
