How could you use a multiplication algorithm to multiply a 4-digit number by a 1-digit number? Choose all that apply.
A. Multiply each place value in order. Regroup if needed. Add any regrouped values to each place value
B. Add the digits in the 4-digit number and multiply by the 1-digit number.
C. Multiply to find the partial products and then add.
D. Use place value to rewrite the 4-digit number as a sum. Use the Distributive Property to find partial products. Add.
E. Multiply the digits in the 4-digit number and add the 1-digit number.

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answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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the diver is 33 feet below the surface.

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