Solve the equation if X = 3
3X2 - 21/3X =
48
20
12
6
Correct Answer : D
Use substitution method to determine the value of the given expression. Use 3 in place of X in the given expression.
\(3X^2-\frac{21}{3}X\)
In place of X insert 3
\(3\left(3\right)^2-\frac{21}{3}\left(3\right)=3\left(9\right)-21=27-21=6\)
When X=3, the equation reduces to 6.
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Related Questions
Correct Answer is C
Explanation
The ratio 15:1000=X:100 can be written in proportion as:
\(\frac{15}{1000}=\frac{X}{100}\)
The value of X is determined by cross-products
\(15\ast100=1000X\)
\(1500=1000X\)
Divide both sides by 1000
\(\frac{1500}{1000}=\frac{1000X}{1000}\)
\(1.5=X\)
Thus, the value of X is 1.5
Correct Answer is D
Explanation
First convert the mixed fraction into improper fraction as follows
\(2 2/7=\frac{\left(2\ast7\right)+2}{7}=\frac{14+2}{7}=\frac{16}{7}\)
Then, multiply the fractions
7/16 x 2 2/7=\(\frac{\mathbf{7}}{\mathbf{16}}*\frac{\mathbf{16}}{\mathbf{7}}=1\)
16 cancels with 16 while 7 cancels with 7 and the result becomes 1.
Correct Answer is B
Explanation
Current total amount of calcium=calcium in tablet-amount of deteriorating
Current amount of calcium=(500-325)mg=175 mg
Correct Answer is A
Explanation
The proportion equation of the ratio 100:2=60:X is
\(\frac{100}{2}=\frac{60}{X}\)
Cross-multiply to find the value of X
\(100X=2\ast60\)
\(100X=120\)
Divide both sides by 100
\(\frac{100X}{100}=\frac{120}{100}\)
\(X=1.2\)
The value of X is 1.2
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