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bazaltina [42]
3 years ago
11

Kevin is 39 years old and daniel is 3 years old. how many years will it take until kevin is only 4 times as old as daniel?

Mathematics
1 answer:
Likurg_2 [28]3 years ago
5 0
I hope this helps you

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If 5x−4y=22 and 3x+6y=30, what is the value of x−5y
amm1812

Answer:

-4 See Below:

Step-by-step explanation:

When you have a system of equations, you need to solve for one variable, and subsitute that variable into the other equation to solve for the other variables value.

3x +6y = 30 In this case, it would be easier to solve for x.

3x= 30-6y  Divide both sides by 3

x= 10-2y

Now we substitute for x in the other equation.

5x- 4y = 22

5(10-2y)-4y=22

50-10y-4y=22

50-14y=22 Add 14y to both sides

50= 14y + 22 Subtract 22 from both sides

28 = 14y     Divide by 14 on both sides.

y = 2

Substitute y=2 and solve for x.

x = 10- 2y

x= 10-2*2

x= 10-4

x= 6

Now we know y=2 and x=6, so we can substitute them into x-5y to find its value.

x - 5y

= 6-5*2

=6-10

= -4

6 0
3 years ago
The length of a rectangle is 5/6 ft. The width is 3/8 ft.How much greater is the length of the rectangle than the width? Express
Oduvanchick [21]
5/6 ft. : 3/8 ft. =
(5/6)  * (8/3) = (5*8)/(6*3) =40/18=20/9=(18+2)/9=2+(2/9)=2,2.....=2,(2)






5 0
3 years ago
Last year, 800 students attended the career fair at west high school. this year,the number of students who attended the career f
Delvig [45]

Answer:

840

Step-by-step explanation:

Last year, 800 students attended the career fair at West High School.  

And, this year the number of students who attended the career fair increased by 5%.

We are asked how many students attended the career fair at West High School this year.

Therefore, the number of students attended the career fair at West High School will be 800[1+\frac{5}{100} ]  =800 \times 1.05 = 840. (Answer)

3 0
3 years ago
How do you turn -0.2 into a fraction
Gemiola [76]

-2/10 which equates to -1/5

7 0
3 years ago
Read 2 more answers
On the day of his 18th birthday harry decided to start saving up money regularly starting on that day he could save £30 on the s
Arada [10]

Answer:

£15120

Step-by-step explanation:

60-18= 42  years

42×12= 504 months

504×30=£15120

6 0
3 years ago
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