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deff fn [24]
3 years ago
12

Hey can someone help me with this pls​

Mathematics
1 answer:
Jobisdone [24]3 years ago
6 0

Answer:

1.   D

2.  C

3.  B

4.  A

look at the symbols and you will notice each of them will be easy to understand

The line under the symbol mean equal to so closed circle

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Two skaters are racing toward a finish line of a race. The first skater has a 40 meter lead and is traveling at a rate of 12 met
Varvara68 [4.7K]

Answer:

20 seconds

Step-by-step explanation:

speed = distance/time

distance = speed * time

The faster racer will catch up to the slower racer in x meters ahead of the slower racer.

The faster racer is 40 meters behind the slower racer, so he travels x + 40 until he catches up.

Slower racer:

speed = 12 m/s

distance = x

time = t

Faster racer:

speed = 14 m/s

distance = x + 40

time = t (the same time as the slower racer)

Slower racer:

distance = speed * time

x = 12t

Faster racer:

x + 40 = 14t

System of equations:

x = 12t

x + 40 = 14t

Since the fist equation is already solved for x, substitute 12t for x in the second equation and solve for t.

12t + 40 = 14t

40 = 2t

20 = t

t = 20

The faster racer catches up in 20 seconds.

7 0
4 years ago
Find three numbers whose sum is 6 and whose sum of squares is a minimum.
pashok25 [27]
Números que suman 6:

3 + 2 + 1 = 6=> 3^2 + 2^2 + 1^2 = 9 + 4 + 1 = 14
4 + 3 - 1 = 6 => 4^2 + 3^2 + (-1)^2 = 16 + 9 + 1 = 26 => do not use negative numbers, because that will increase the other numbers.
 
5 + 1 + 0 = 6 => 5^2  + 1 + 0 = 25 + 1 + 0 = 26

4 + 2 + 0 = 4^2 + 2^2 + 0 = 16 + 4 = 20

When you use zero the you increase the sum of the squares.

Then the three numbers that yields the minimum sum of the squares is 1, 2 and 3. 
4 0
3 years ago
2(x+y) = 61-2y<br> 4x-4 = 18-3y
Naddik [55]

Answer:

x = 8

y = -7

Step-by-step explanation:

This is a system of equations called simultaneous equations. We shall solve it by elimination method Step 1We shall label the equations (1) and (2)−3y−4x=−11.....(1)3y−5x=−61......(2)Step 2Multiply each term in equation (1) by 1 to give equation (3)1(-3y-4x=-11).....(1)-3y-4x=-11....(3)Step 3Multiply each term in equation 2 by -1 to give equation (4)-1(3y−5x=−61)......(2)-3y+5x=61.....(4)Step 4-3y-4x=-11....(3)-3y+5x=61.....(4)Subtract each term in equation (3) from each term in equation (4)-3y-(-3y)+5x-(-4x)=61-(-11)-3y+3y+5x+4x=61+110+9x=729x=72Step 5Divide both sides of the equation by 9, the coefficient of the unknown variable x to find the value of x 9x/9 = 72/9x = 8Step 6Put in x = 8 into equation (2)3y−5x=−61......(2)3y-5(8)=-613y-40=-61Collect like terms by adding 40 to both sides of the equation 3y-40+40=-61+403y=-21Divide both sides by 3, the coefficient of y to find the value of y 3y/3=-21/3y=-7Therefore, the values of x and y that satisfy the equations are 8 and -7 respectively

4 0
4 years ago
How can I solve (n+1) x 2= 10 <br> Please someone answer :(
Ray Of Light [21]
(n+1)x 2=10 
2n+2=10 
2n=8
n=4
4 0
4 years ago
Read 2 more answers
The cost of tyre has increased by 20% to £78. work out the original price
tiny-mole [99]
The original price was 65
3 0
3 years ago
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