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3 years ago

A girl is 21 years old and her brother is a third her age. When the girl is 36, what will be the age of her brother?

1 answer:

3 0

If the girl is 21 years old and her brother is a third of her age means he is 7 years old. now his sister is 36 yard old so that means he is 12 years old

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Find the difference in simplest form for 3/5-1/7

vitfil [10]

3/5 - 1/7

Find the LCM of 5 and 7 to find equivalent fractions for both fractions

LCM = 35

3/5 = 21/35

1/7 = 5/35

So 21/35 - 5/35 = 16/35

I'm pretty sure that's the simplest form because I can't think of a common factor of 16 and 35 by which to reduce it further.

6 0

3 years ago

I need help on khan academy and I’m willing to pay half right when you start the work and when you finish all the work I’ll pay

harina [27]

Answer:

$x\approx 50^\circ$

Step-by-step explanation:

$c^2 = a^2 + b^2 - 2ab(cos(C))$

See the figure below to get the values as:

$7^2=7^2+9^2-2\left(7\right)\left(9\right)cos\left(x\right)\\\\cos(x)=\frac{7^2+9^2-7^2}{2\cdot \:7\cdot \:9}\\\\x\approx 50^\circ$

There are multiple concepts to solve this problem. This is one of the concept used in high school. Other concept to solve this problem is to use the concept of isosceles triangle. An isosceles triangle is a triangle with (at least) two equal sides. The angles shared by the two equal sides are also equal. So that the sum of all the three angles will add up to 180.

$x+x+80=180\\\\2x=100\\\\x=50^{\circ}$

Best Regards!

5 0

4 years ago

Christina bought a car that cost $18000. She put $4000 down and financed the rest at 3.8%/a compounded monthly. She wants to pay

skelet666 [1.2K]

Christina's monthly payment is $583

Her total interest payment is $584

What does monthly compounding mean?

Monthly compounding means that the interest on the loan is computed every month, it shows the frequency of interest computation during the loan tenure.

In this case, the monthly payment can be determined using the present value formula of an ordinary annuity since the monthly payment would occur at the end of each month.

PV=PMT*(1-(1+r)^-N/r

PV=loan amount=cost of car-down payment

PV=$18,000-$4,000

PV=$14,000

PMT=monthly payment=unknown

r=monthly interest rate=3.8%/12=0.003166666666666670

N=number of monthly payments=25

$14,000=PMT*(1-(1+0.00316666666666667)^-25/0.003166666666666670

$14,000=PMT*(1-(1.00316666666666667)^-25/0.003166666666666670

$14,000=PMT*(1-0.924001500485879000)/0.003166666666666670

$14,000=PMT*0.075998499514121000/0.003166666666666670

PMT=$14,000/0.075998499514121000*0.003166666666666670

PMT=$583.34

PMT=$583( nearest dollar)

The total interest is the total 25 monthly payments minus the loan amount

total interest=( $583.34*25)-$14,000

total interest=$583.50

total interest=$584

Find out more about ordinary annuity on:brainly.com/question/25792915

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4 0

2 years ago

Decide whether the relation defined by the graph to the right defines a lucion and give the domain and an Does the graphed relat

bekas [8.4K]

Answer:

Step-by-step explanation:

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4 years ago

If 6 coins are flipped, find the probability that there is at least 1 heads.<br><br>

astraxan [27]

Answer:

Step-by-step explanation:

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4 years ago