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Ierofanga [76]
3 years ago
15

Help me slove these 3 problems

Mathematics
1 answer:
igomit [66]3 years ago
4 0
3) Take the original price and subtract the original price * the discount percentage

99.50 - (99.50 * 0.50)
99.50 - 49.75
49.75
Option C is your answer.

4) Take the original price and add the original price * the tax rate

99.50 + (99.50 * 0.04)
99.50 + 3.98
103.48
Option D is your answer.

5) Take the original price and add the original price * the markup rate

3.95 + (3.95 * 0.20)
3.95 + 0.79
4.74
Option D is your answer. 
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Pls help me with 19,20 pls thx and show me how u did it
Anastasy [175]
For number 19:
"at least 150" means either 150 ≤ ?  or ? ≥ 150

plus 3 so +3x

The answer would be 150 ≤ 100 + 3x

Number 20:

A is at -2.5. The inverse is the opposite so 2.5
7 0
3 years ago
How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an
JulsSmile [24]

Answer:

31.5 kilograms of a 5% salt solution and 13.5 kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution .

Step-by-step explanation:

Let us assume that the number of kilograms of a 5% salt solution used be x .

Let us assume that the number of kilograms of a 15% salt solution used be y .

As given

A 5% salt solution and 15% salt solution must be mixed together to make 45kg of an 8% salt solution .

Equation becomes

x + y = 45

5% is written in the decimal form .

= \frac{5}{100}

= 0.05

15% is written in the decimal form .

= \frac{15}{100}

= 0.15

8% is written in the decimal form .

= \frac{8}{100}

= 0.08

Thus

Concentration of 5% salt solution × Number of kilograms of 5% salt solution used + Concentration of 15% salt solution × Number of kilograms of  15% solution used = Concentration of 8% salt solution × Number of kilograms of 8% salt solution

Thus

0.05x + 0.15y = 0.08 × 45

Simplify the above

\frac{5x}{100} + \frac{15y}{100} = \frac{8\times 45}{100}

5x + 15y = 360

Thus two equations becomes

x + y = 45

5x + 15y = 360

Multiply x + y = 45 by 5 and subtracted from 5x + 15y = 360 .

5x - 5x + 15y - 5y = 360 - 225

10y = 135

y = \frac{135}{10}

y = 13.5 kilograms

Put value of y in the equation

x + 13.5 = 45

x = 45 - 13.5

x = 31.5 kilograms

Therefore the 31.5 kilograms of a 5% salt solution and 13.5 kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution .

5 0
3 years ago
The probability of rolling a '4' or a '6' on one toss of a standard six-sided die is
sesenic [268]
<span>probability of getting 4 or 6 is 1/6 + 1/6 = 2/6 = 1/3</span>
7 0
3 years ago
Which of the following is a like radical to 3x square root 5?
Airida [17]
Pretty sure it’s D good luck
8 0
3 years ago
The annual expenditure of the US federal government is approximately 444 trillion dollars.
Alexeev081 [22]

Answer:

4 x 10^8 metres.

[0.0001 x (4 x 10^12)

= 4 x 10 ^8

5 0
3 years ago
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