No because they're two separate shapes of different porportions. one is 5 cm x 9 cm and the other is 3 x 7 they're not similar. It's hard to explain but a shape that was 10 cm x 30 cm would be similar to the same shape that was 1 cm x 3 cm's.

5 0

3 years ago

A city planner wants to estimate, with a 99% confidence level, the average monthly residential water usage in the city. Based on

torisob [31]

Answer: 82

Step-by-step explanation:

The formula to find the sample size is given by :-

$n= (\dfrac{z^*\cdot \sigma}{E})^2$

, where E = Margin of error.

$\sigma$ = Population standard deviation for the prior study.

As per given , we have

$\sigma=387.40$ gallons.

Margin of error : E= 110 gallons

Critical value for 99% confidence level = z* = 2.576

Then, the required sample size : $n= (\dfrac{(2.576)\cdot (387.40)}{110})^2$

$n= (9.07220363636)^2\approx82$ {Rounded to the nearest integer.}

Hence, the minimum sample size = 82

3 0

3 years ago

X/9= -14 <br>but you have to multiply both sides by 9<br>how do you solve ?<br>algebra

Ulleksa [173]

hey,

$\frac{x}{9} = - 14 \\ \\ x = - 14 \times (9) \\ x = - 126 \\ \\ \\ or \\ \\ \\ \frac{x}{9} = - 14 \\ \\ (9) \times \frac{x}{9} = - 14 \times (9) \\ \\ \frac{9x}{9} = - 126 \\ \\ x = - 126$

$\boxed{crsjr}$

8 0

4 years ago