exam Maths Puzzle Numerical Ability

graph each compound or absolute value inequality

x+8y>8 and x-2y<10

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exam Other Question

can you pleas help me out with my homework one more time ??

1 . 12-[20-2(6 to secend power /3 times 2 to secend power)]=

2. 20/(5-3)+5 to secend power (3)=

3. 18- The average age of Amtrak passenger train cars is 19.4 years. If the distribution of ages is normal and 20% of the cars are older than 22.8 years, find the standard deviation.