Answer:
b.
Step-by-step explanation:
150 = 12
150 +150 = 300 which = 24
150 + 150 + 150 = 450 which =36
the remaining 50 is 12 ÷ 3, so 4. 36 + 4 = 40.
therefore, 40 L of gasoline are needed to go 500km
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Step-by-step explanation:
(4s + 2) × (5s² + 10s +3)
we know immediately the first and the last term of the result, because there is only one operation to build them :
20s³ and 6.
so, the first answer option is already eliminated.
let's multiply
4s×5s² + 4s×10s + 4×3s + 10s² + 20s + 6
20s³ + 40s² + 12s + 10s² + 20s + 6
20s³ + 50s² + 32s + 6
so, the last answer option is correct.