7. Work out the length of side s to 3 significant figures.

s = 3.381cm

Step-by-step explanation:

We know all the angles because a triangle's angles add up to 180°.

So, we have 90, 65, and 25° angles in this triangle.

To find, s, of this triangle, we need to use Sin because Sin uses the angle opposite of the side, which is 25°.

I am assuming you know your trigonometry, but I attached an image that will help too.

So, we have Sin(25) = opposite/hypotenuse.

We have the length of the hypotenuse, 8cm. So plug it in.

And solve for opposite, which is the side, s.

Sin(25) * 8 = opposite.

3.381cm = s.

Hope this helps

b

step-by-step explanation:

the final amount you will pay is $68.04.

the tip is determined by the pre-tax amount, so we calculate the tip based on the original bill, not after we've added sales tax.

to find the tip:

we can divide 54.00 by 100 to get 1% of 54. then we multiply that by 18.

54 / 100 = .54

.54 x 18 = 9.72

tip = 9.72$

to find the tax:

we can divide 54.00 by 100 to get 1% of 54. then we can multiply that by 8 to get 8%.

54 / 100 = .54

.54 x 8 = 4.32

tax= 4.32

now we can add the tip and tax to the bill to get our total.

54 + 9.72 + 4.32 = 68.04

total: $68.04

step-by-step explanation: