Helen draws a random circle.
She then measures its diameter and circumference. She gets a circumference, C, of 405 mm correct to 3 significant figures.
She gets a diameter, d, of 130 mm correct to 2 significant figures.
Helen wants to find the value of it using the formula =
π= C÷d
Calculate the lower bound and upper bound for Helen's value of it.
Give your answers correct to 3 decimal places.

Pls help me. ❤❤

Upper bound 3.116

Lower bound 3.125

Step-by-step explanation:

The random circle Hellen drew has a circumference of C=405mm to 3 significant figures and she gets a diameter, d, of 130 mm correct to 2 significant figures.

We need to use the formula

We substitute the values to get:

Therefore Hellen's value for π is 3.115 to three decimal place.

To find the lower and upper bound, we half the specified degree of accuracy.

We then add it to the rounded value to get the upper bound to be:

3.115+0.0005=3.1155

The lower bound is 3.115-0.0005=3.1145

b. hoped i'm right lol

step-by-step explanation:

x-150=475   x=625

step-by-step explanation:

if the bike after the sale ($150) is $475 then just simply add 150 to 475.