book Maths Puzzle Numerical Ability

when the sum of 3.0 and 5.0 is subtracted from the product of 3.0 and 5.0, what is the difference?(the answers are....23.0, 20.0, 7.0, or none of these)

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Thank you bonster for help. I understand now..You pic is beautiful. Congrats on wedding. The access ramp to an expressway is 850 feet long. The measure of the angle of elevation is 4 degrees.About how long is the expressway from the horizontal at the beginning of the ramp?