X is defined as 30 - of 30 - If y-x2-4 x-7- then find the value of y-A- 142B- 134- 143D- 124

The correct option is D 12430% of 30 = 30/100 nbsp;× nbsp;30 = 9 Substituting x = 9 in the equation of y y = 9^2 nbsp;+ 4(9) + 7 = 81 + 36 + 7 = 124 ...

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Byju's Answer

Standard VII

Mathematics

Percentage of a Number

x is defined ...

Question

$x$ is defined as 30% of 30. If $y = x^{2} + 4 x + 7,$ then find the value of y.

142

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134

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143

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124

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Solution

The correct option is D $124$
$30 % o f 30 = \frac{30}{100} \times 30 = 9$

Substituting $x = 9$ in the equation of $y$

$y = 9^{2} + 4 (9) + 7 = 81 + 36 + 7 = 124$

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x is defined as 30% of 30. If y=x2+4x+7, then find the value of y.

The correct option is D 12430% of 30=30100×30=9 Substituting x=9 in the equation of y y=92+4(9)+7=81+36+7=124

$x$ is defined as 30% of 30. If $y = x^{2} + 4 x + 7,$ then find the value of y.

The correct option is D $124$
$30 % o f 30 = \frac{30}{100} \times 30 = 9$

Substituting $x = 9$ in the equation of $y$

$y = 9^{2} + 4 (9) + 7 = 81 + 36 + 7 = 124$