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prisoha [69]
3 years ago
6

When solving a system by substitution one should

Mathematics
1 answer:
Sophie [7]3 years ago
6 0
The answer is B my teacher told me.
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The equation for the circle below is x^2+y^2=4. what is the length of the circle’s radius
Inessa05 [86]
2 because in the equation of a circle it is x^2 + y^2 = r^2, r=radius so you would take the square root of 4, leaving the radius of the circle to be 2.
6 0
3 years ago
Briony invests some money. Interest is paid on the money at a rate of 2% per annum for the first year and 1% per annum for the s
nalin [4]

Answer:

Brionny invested £8400.

Step-by-step explanation:

Simple Interest

This is a simple interest problem.

The simple interest formula is given by:

E = P*I*t

In which E is the amount of interest earned, P is the principal(the initial amount of money), I is the interest rate(yearly, as a decimal) and t is the time.

After t years, the total amount of money is:

T = E + P

In this question:

We divide in two intervals, the first year and the second year. We have to know that the amount after the end of the first year is the principal at the start of the second year.

First year:

Amount of 2% interest, during 1 year.

So the interest earned is:

E = P*I*t = P*0.02*1 = 0.02P

The total amount at the end of the first year is:

T = E + P = 0.02P + P = 1.02P

Second year:

We have that:

P = 1.02P

The interest earned is of:

E = P*I*t = 1.02P*0.01*1 = 0.0102P

The total amount is:

T = E + P = 0.0102P + 1.02P = 1.0302P

After two years, the investment is worth £8653.68 How much did Briony invest?

So

1.0302P = 8653.68

P = \frac{8653.68}{1.0302}

P = 8400

Brionny invested £8400.

3 0
3 years ago
Spinner has 7 pieces, 1 black, 2 gray, 4 white, what is the probability that I would land on a gray piece?
Firlakuza [10]

Answer:

2/7

Step-by-step explanation:

there are 2 gray prices out of 7

6 0
2 years ago
937 divided by 7 plz help me
attashe74 [19]
133.857142857 I’m not completely sure
7 0
2 years ago
Read 2 more answers
I need help right now please!<br> I have 2 questions!
yKpoI14uk [10]
1 is 28
2 is 13, 84, 85

Figure both by the Pythagorean Theorem<span />
5 0
3 years ago
Read 2 more answers
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