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To simplify the expression and convert the exponents to positive, we can use the properties of integer exponents:
150 ⋅ 7^-2 (-4)^-3
First, let's deal with the negative exponents:
7^-2 = 1/7^2 = 1/49
(-4)^-3 = 1/(-4)^3 = 1/(-64) = -1/64
Now, substitute these values back into the expression:
150 ⋅ (1/49) ⋅ (-1/64)
Next, simplify the expression:
150/1 ⋅ 1/49 ⋅ (-1/64) = (150 ⋅ -1)/(1 ⋅ 49 ⋅ 64) = -150/3136
So, the equivalent expression with only positive exponents is -150/3136.
The correct answer is:
72(−4)3