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3 years ago

If m= (-3) and passes through (1,-5), the equation of the line is y= ?

Mathematics

1 answer:

irinina [24]3 years ago

6 0

Y = -3x + c

Using (1,-5):
-5 = -3(1) + c
c = -5 + 3(1) = -2

Therefore:
y = -3x - 2

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stira [4]

Answer:

-2.5

Step-by-step explanation:

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3 years ago

an electrician can wire on average 4.5 houses in a week. how many months will it take her to wire houses if she wires the same n

NikAS [45]

I believe it would be 12 months. How i got this answer was by dividing 55 by 4.5.

Even though it is a very vague explanation as to how i got the answer, I hope this helps you.<span />

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3 years ago

Paddy and Anna each invest $2000 for 5 years.

Serga [27]

Answer: r= 1.22

Step-by-step explanation:

Formula for amount with simple interest = $P(1+rt)$

, where

P= principal value , r= rate of interest , t = time.

Given: P= $2000, t= 5 years, r= 1.25% = 0.0125

$A=2000(1+0.0125\times5)\\\\=2000(1.0625)=2125$

Formula to compute compound amount : $P(1+r)^t$

$=2000(1+r)^5$

When both have same worth then

$2000(1+r)^5=2125\\\\\\ (1+r)^5=\dfrac{2125}{2000}\\\\\\ (1+r)^5=1.0625$

taking log on both sides , we get

$5\ln (1+r)=\ln 1.0625\\\\\\ 5\ln (1+r)=0.0606246\\\\\\ \ln (1+r)=0.012125\\\\\\ 1+r=e^{0.005266}\\\\\\ 1+r=1.0122\\\\ r=0.0122\\\\ \\ r=1.22\%$

Hence, Value of r= 1.22

6 0

3 years ago

when asked to factor the x^2 - 100, a student gives the answer (x -10) (x-10). what is wrong with this answer?

aalyn [17]

$x^2-100\\\\=x^2-10^2\\\\=(x+10)(x-10)\\\\\text{The difference of two squares formula is}~ a^2 -b^2 =(a+b)(a-b),\\\\\text{So, the student did not apply it properly}$

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1 year ago

Considering the activity series given below for metals and nonmetals, which reaction will occur? al > mn > zn > cr >

victus00 [196]

The activity series is an arrangement of species in order of reactivity.

<h3>What is the activity series?</h3>

The activity series is an arrangement of species in order of reactivity. The position of a specie in the series determines the possibility of certain reactions.

The following are the fates of these reactions;

2NaBr + I2--------->2NaI + Br2 - Not possible
2Fe + Al2O3 ----------> 2Al + Fe2O3 - Not possible
2AgNO3 + Ni ----------> Ni(NO3)2 + 2Ag - possible
Pb + Zn(C2H3O2)2 ----------> Zn + Pb(C2H3O2)2 - Not possible

Learn more about activity series:brainly.com/question/18080147

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8 0

1 year ago