Answer: the store charged $40 for the bike helmet before tax.
Step-by-step explanation:
Let x represent the amount that the store charge for the bike helmet before tax.
If the sales tax rate was 8%, it means that the amount of tax that was charge is
8/100 × x = 0.08 × x = 0.08x
Monica paid sales tax of $3.20 when she bought a new bike helmet. This means that
0.08x = 3.2
Dividing the left hand side and the right hand side of the equation by 0.08, it becomes
0.08x/0.08 = 3.2/0.08
x = 40
Answer:
0.23 per ounce
Step-by-step explanation:
2.89 / 12.4 = 0.23 per ounce
Explanation:
The formula for law of cosines is:
This is written at the top of your paper.
The angle is substituted where the capital A is. The side opposite to the angle is the angle name's lowercase. The two other sides are b and c.
Substitute all the information you know, then isolate the variable that you do not know.
When your formula is rearranged to look like this:
Solve the left side and punch into your calculator:
cos⁻¹(left side) to find the angle A.
The first seat can be any one of the 4 people.
For each of those . . .
The second seat can be any one of the remaining 3 people.
For each of those . . .
The third seat can be either one of the remaining 2 people.
For each of those . . .
The fourth seat is the last remaining person.
Total number of possible ways to line them up = (4 x 3 x 2 x 1) = 24 ways.