129.2 is 38% of what number? a. 340 b. 29.4 c. 420 d. 49.1 Plss help
2 answers:
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Answer:
The first blank is 81+9=x-1
The second blank is 9x+3=x^2-1
Step-by-step explanation:
For the first part, you must set up the equation (9x+3)^2 then you must multiply the exponent to the inside exponents +
next, simplify.
81+9=x-1
For part two, set up equation. Then simplify 9x+3=