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3 years ago

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The square of sophie's age is 16 less than joanna's age. it is also the case that joanna's age is 8 times that of sophie. how ol

d is joanna?

1 answer:

mote1985 [20]3 years ago

5 0

Let s be Sophie's age. Then joanna is s²+16. Joanna is also 8s, if Sophie is s. So:
s²+16=8s
s²-8s+16=0
(s-4)²=0
s=4
Sophie is 4; Joanna is 32
☺☺☺☺

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Answer:

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Step-by-step explanation:

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3 years ago

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Answer:

Option C.

Step-by-step explanation:

The given logarithmic equation is

$\log_2(x+11)=4$

It can be written as

$(x+11)=2^4$ $[\because log_ax=y\Leftrightarrow x=a^y]$

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Now, to check whether $x=5$ is a true solution or not. Substitute $x=5$ in the LHS of given equation.

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3 years ago

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Answer:

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