exam Maths Puzzle Numerical Ability

Please show me the steps to solving this problem:

-d/7 = -13

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exam Other Question

In a weekend baseball game tournament, Joel had 4 hits in 13 times at bat. That is he hit safely 4/13 of the time. Write the decimal equivalent for Joels hitting, rounding, to three decimal places. (Than number is Joels batting average) The width of a rectangular gate is 2 meters (m) larger than its heights. The diagonal brace measures exponent 6. Find the width and the height.