Na calculadora, apertei algumas teclas. Depois, pressionei tres vezes a tecla =, e apareceu a sequência: 420

a-) Quais teclas apertei inicialmente?

b-) Se eu apertar mais três vezes a tecla =, que números aparecerão?

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

step-by-step explanation:

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7x7=4 so if u carry the 9 it will be 33

if the rectangular pool has a area of 192 square ft. and length of 15 ft. you must divide 15 into 192. 192 ÷ 15 = about 13 ft.