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REY [17]
3 years ago
8

Resultado da prova da olimpíadas de matemática​

Mathematics
1 answer:
Marianna [84]3 years ago
6 0
I don’t understand this question
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Use the formula for simple interest, I = Prt, to find the indicated quantity. Assume a 360 day year.
Kipish [7]

Answer:

r = 8%

Step-by-step explanation:

Given that,

Interest, I = $24

Principal, P = $1200

Time, t = 90 days = 90/360 = 1/4 years

We need to find the rate.

We know that,

The simple interest is given by :

I=\dfrac{Prt}{100}

Put all the values,

r=\dfrac{100I}{Pt}\\\\r=\dfrac{100\times 24}{1200\times \dfrac{1}{4}}\\\\r=8\%

So, the rate is 8%.

4 0
3 years ago
Solve each equation 7:x=2:3
Olenka [21]

7 : x = 2 : 3

- divide 7 by 2.

7/2 = 3.5

- this is the scale factor.

- now multiply this by 3.

3 X 3.5 = 10.5

so, x = 10.5

6 0
3 years ago
Select the correct answer from the drop down menu
anygoal [31]

The last one , because I will now solve it for you and prove therefore.

x²–4x+5=0;

D=(–4)²–4•5=16–20= –4= (2i)².

So:

x1= (4–2i)/2= 2–i

x2= (4+2i)2= 2+i.

This is the whole answer....

Three other u will solve by yourself and have roots which will not be suitable.

6 0
3 years ago
What is 33 1/3% less than $60
andriy [413]

Answer:

$40

Step-by-step explanation:

33 1/3% is equal to 1/3. 1/3 less than something is 2/3 of it. 2/3 of $60 is $40.

5 0
3 years ago
After m months, the length of a fingernail is 10+3m millimeters. How long is the fingernail after eight months? 36 month?
Thepotemich [5.8K]

Answer: 334

Step-by-step explanation:

5 0
3 years ago
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