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denis-greek [22]
2 years ago
14

Solve the equation -4x + 7 y equals 20. Y=3x+15

Mathematics
1 answer:
satela [25.4K]2 years ago
3 0

Substitue what y equals for y and solve.

-4x+7(3x+15)=20 \\-4x+27x+105=20 \\23x=-85 \\x=-\boxed{\frac{85}{23}}

Hope this helps.

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A coffee table cost $120 more than a chair.Ali bought 1 coffee table and 5 such chairs for $258.How much did each chair cost ?
Alex17521 [72]
Hope this help you!!

4 0
3 years ago
Simplify the following -1/2 + 3 1/3
ZanzabumX [31]

Answer:

59/6 =9.83333

Simplify 31/3

Step-by-step explanation:

I'm sure it's 31/3 so check just in case

4 0
2 years ago
John invests $3,000 into an account that earns 4.7% interest compounded quarterly. Write an equation and us it to find the value
kow [346]

Answer:

The equation is;

A = 9,000(1 + 0.047/4)^48

The value is

$15,767.28

Step-by-step explanation:

Here we want to find the value of an investment after 12 years, given its interest rate;

Mathematically the amount which is the value would be;

A = I( 1 + r/n)^nt

Where A is the amount in 12 years

I is the initial amount invested = $3,000

r is the interest rate = 4.7% = 4.7/100 = 0.047

n is the number of times interest is compounded yearly = 4 since it is quarterly ( once every three months)

t is the number of years = 12

Substituting these values, we have

A = 9,000(1 + 0.047/4)^(12^4)

A = 9,000(1 + 0.047/4)^48

The above is the expression

A = 9,000(1 + 0.01175)^48

A = 9,000(1.01175)^48

A = $15,767.28

8 0
3 years ago
if in a drug-study to test the effectiveness of a new drug for treating the common cold, you are randomly assigned to a group th
Free_Kalibri [48]

This means that you are in the experiment group

It is common to choose a group of people to study the effect of certain things like the one given in this question. The selection of people is done after designing the sample size for a certain population. The design varies depending on whether the analysis is qualitative or quantitative.

The people who lie in the sample size actually contribute to the experiment are said to be part of it.

Therefore, if you are part of the study that is used to test the effectiveness of a new drug for treating the common cold. It means you are part of the experiment group.

You can learn more about the experiment groups and control groups from

brainly.com/question/24708013
#SPJ4

3 0
1 year ago
8 exponent 2 times 6 exponent 2
ziro4ka [17]

Answer:

2304

Step-by-step explanation:

8²×6² = ?

8² = 8×8 = 64

6² = 6×6 = 36

64×36 = 2304

Hoped this helped !

Cheers, Z

3 0
3 years ago
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