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larisa86 [58]
2 years ago
14

How many kilometers are there in 4 miles?

Mathematics
1 answer:
raketka [301]2 years ago
3 0
There are 6.4 Kilometers in 4 miles
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The square of a number plus three times the number is 70. find the numbers.
Harrizon [31]

Answer:

Step-by-step explanation:

The equation for that is

x^2+3x=70

If we subtract over the 70, we have a quadratic that we can factor to solve for the values of x that will make that equation true.

x^2+3x-70=0

Now we need the factors of 70 that will either add or subtract to give us the linear term of 3. The factors of 70 that will work are 10 and 7. 10 times 7 is 70, and 10 - 7 = 3:

x^2+10x-7x-70=0 and now we will factor by grouping:

(x^2+10x)-(7x-70)=0 and factor out what's common:

x(x+10)-7(x+10)=0

The factor (x + 10) is common, so we will now factor that out:

(x+10)(x-7)=0

By the Zero Product Property, either x + 10 = 0 or x - 7 = 0, so x = -10 or 7

Those are the 2 numbers that will work.

(-10)^2+3(-10)=70 simplifies to

100 - 30 which does in fact equal 70. OR

(7)^2+3(7)=70 which simplifies to

49 + 21 which also equals 70.

So you're done!

3 0
3 years ago
Solve 2.23x + 6 ( 56.1 ).
tensa zangetsu [6.8K]

8637778929202919889988

6 0
3 years ago
The equation y=ax describes the graph of a line.if the value of a is positive,the line
ahrayia [7]
If the value of a is positive, the line slopes upwards.
5 0
3 years ago
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HELPP. I DON’T GET HOW TO DO THIS!!!! You have to write 2 equations and solve using method of substitution or method of eliminat
ipn [44]

Answer:

Can you make the picture bigger if you do i can solve it for u my co puter donset zoom in so..

Step-by-step explanation:

6 0
2 years ago
Can someone help me with this one i am confused
RideAnS [48]

Answer:

Formula: (x^2 -h) +(y^2 -k)=r^2

The number on the right side of the = is the radius of the circle squared.

(h,k) is the center of the circle.

4 0
3 years ago
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