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Shtirlitz [24]
3 years ago
10

Lin's father is paying for a $20 meal. He has a 15%-off coupon for the meal. After the discount, a 7% sales tax is applied.

Mathematics
2 answers:
NeTakaya3 years ago
8 0

Answer:

$18.19

Step-by-step explanation:

First - Convert all the percents into decimals by moving the decimal to the left twice, 15% -> 0.15, 7% -> 0.07

Second - Then, the discount, multiply & subtract , 20 * 0.15 = 3 -> 20 - 3 = 17

Third - Then, the tax, multiply & add, 17 *0.07 = 1.17 -> 17 + 1.17 = 18.19

Sunny_sXe [5.5K]3 years ago
5 0
I’m pretty sure it’s $16.60 but I’m not sure but I hope you get it right!
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-4y + 14 = 22<br><br> -6x + 5 = -1
Naya [18.7K]

Answer:

x = 1, y = -2

Step-by-step explanation:

7 0
3 years ago
What Is the.value of 5^3i^9
gregori [183]
5^3=5\cdot5\cdot5=125\\\\i=\sqrt{-1}\to i^2=-1\\\\i^9=i^8+1=i^8\cdot i^1=-1\cdot i=-i\\\\5^3i^9=125(-i)=\boxed{-125i}
4 0
4 years ago
What is a1? what is d? what’s the equation? what is a7? what is a59?
Zina [86]
Answer:

a1 = 2

d = 3

an = 2 + (n - 1) * 3

a7 = 20

a59 = 176

Steps:

a1 is the initial value (when n equals 1), and since there are 2 crosses, it is 2.

d is the added value to each amount of crosses. And since the second amount is 5 and the third amount is 8, we can determine that each n is adding 3 crosses, therefore making d = 3.

The equation is simply plugging in the values for a1 and d.

A7 is simply plugging in 7 for n in the equation and solving for it. So;

a7 = 2 + (7 - 1) * 3

a7 = 2 + 6 * 3

a7 = 2 + 18

a7 = 20

And same thing as the last for 59 except substitute 59 in for where you put 7;

a59 = 2 + (59 - 1) * 3

a59 = 2 + 58 * 3

a59 = 2 + 174

a59 = 176
8 0
3 years ago
Read 2 more answers
The variable z is directly proportional to x. When x is 10, z has the value 140.
gayaneshka [121]

Answer: z = 280

Step-by-step explanation:

If two variables are directly proportional, it means that an increase in the value of one variable causes an increase in the value of the other variable. Also, a decrease in the value of one variable causes an decrease in the value of the other variable.

The variable z is directly proportional to x. If we introduce a constant of variation, the expression would be

z = kx

When x is 10, z has the value 140. It means that

140 = 10k

k = 140/10

k = 14

The equation becomes

z = 14x

the value of z when x = 20 is

z = 14 × 20

z = 280

7 0
4 years ago
Don’t know how to solve these :l
xeze [42]

Answer:

452.16 cm²

Step-by-step explanation:

3.14 × 12² = 452.16 cm²

3 0
3 years ago
Read 2 more answers
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