7.25% sales tax on a $89.99 cable modem

Sales tax is: $6.52

Step-by-step explanation:

You must multiply $89.99 by 0.0725 (this is how you find sales tax, moves decimal two places to the left)

When you multiply that, you get 6.524275, and you must round to 6.52. This is your sales tax.

The total price (with sales tax included) is: $96.51

b.an increase in a causes b to decrease

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.