Question

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Answer 1

Respuesta:

$1)x + 3 = 18 \\ x = 18 - 3 \\ x = 15$

$5)x - 3 \times 7 = {20}^{2} \\ x - 21 = 400 \\ x = 400 + 21 \\ x = 421$

$6) \frac{1}{3} x + 8 = 21 \\ 3( \frac{1}{3} x + 8) = 21 \times 3 \\ x + 24 = 63 \\ x = 63 - 24 \\ x =3 9$

$8) \frac{1}{2}x = \sqrt{81} \\ \frac{1}{2} x = 9 \\ x = 9 \div \frac{1}{2} \\ x = 9 \times 2 \\ x = 18$

$10)x + 25 = {10}^{2} \\ x + 25 = 100 \\ x = 100 - 25 \\ x = 75$

$11) \frac{x}{8} = 103 \\ \frac{x}{8} \times 8 = 103 \times 8 \\ x = 824$

$13)321$

$15)90$

$16) \sqrt{2500} = 50$