Please answer correctly, work is optional.

Mathematics

2 answers:

kati45 [8]2 years ago

3 0

Answer: 0.845

Step-by-step explanation: 1.69 divided by two is 0.845

vagabundo [1.1K]2 years ago

3 0

Answer. 1.3 km

Explanation. To find the area of a square, multiply the base and the height. Because it is a square, we know that these two numbers would have to be the same. Therefore, this number has a square root. To find it, find the sq root of 1.69. The answer is 1.3. To test this, multiply 1.3 by 1.3, you get 1.69.

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frosja888 [35]

The answer is E: (b-c)(a+c)

3 0

3 years ago

Y is directly proportional to square root of x<br> If y=56 when x=49 find,<br> y when x=81

STALIN [3.7K]

$\qquad \qquad \textit{direct proportional variation} \\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad \stackrel{\textit{constant of variation}}{y=\stackrel{\downarrow }{k}x~\hfill } \\\\ \textit{\underline{x} varies directly with }\underline{z^5}\qquad \qquad \stackrel{\textit{constant of variation}}{x=\stackrel{\downarrow }{k}z^5~\hfill } \\\\[-0.35em] \rule{34em}{0.25pt}$

$\stackrel{\begin{array}{llll} \textit{"y" directly}\\ \textit{proportional to }\sqrt{x} \end{array}}{y = k\sqrt{x}}\qquad \textit{we know that} \begin{cases} y = 56\\ x = 49 \end{cases}\implies 56=k\sqrt{49} \\\\\\ 56=7k\implies \cfrac{56}{7}=k\implies 8=k~\hfill \boxed{y=8\sqrt{x}} \\\\\\ \textit{when x = 81, what is "y"?}\hfill y=8\sqrt{81}\implies y=8(9)\implies y=72$