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Eva8 [605]
3 years ago
6

Help me please due in 40 minutes

Mathematics
2 answers:
levacccp [35]3 years ago
4 0

Answer: x = -2

Step-by-step explanation:

5(3y -5) -4y = -14

15y - 25 - 4y = -14

11y - 25 = -14

11y = 11

y = 1

5x - 4(1) = -14

5x - 4 = -14

5x = -10

x = -2

DerKrebs [107]3 years ago
3 0

Answer:

x = -2

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

Point Form:

( − 2 , 1 )

Equation Form:

x  =  − 2 ,  y  =  1

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a motorboat travels 371 kilometers in 7 hours going upstream. it travels 525 kilometers going downstream in the same amount of t
e-lub [12.9K]

Answer:

Speed of boat in still water = 64 km/hr

Speed of the current = 11 km/hr

Step-by-step explanation:

Let the speed of motorboat in still water = x km/hr

Let the speed of current = y km/hr

Motorboat travels 371 km in 7 hours going upstream.

Speed of motorboat while going upstream = speed of motorboat in still water - speed of current = (x-y)

=> \[x-y = \frac{371}{7}\]

=> \[x-y = 53\] ------------------------------(1)

Motorboat travels 525 km in 7 hours going downstream.

Speed of motorboat while going downstream = speed of motorboat in still water + speed of current = (x+y)

=> \[x+y = \frac{525}{7}\]

=> \[x+y = 75\] -----------------------------(2)

Solving for x and y from (1) and (2):

Adding (1) and (2):

2x = 128

=> x = 64

Substituting the value of x in (1), y = 11

6 0
3 years ago
It costs $0.60 per ft² to cover a right triangular field with sod. The side lengths of the field are 300 ft, 400 ft, and 500 ft.
algol [13]
In this triangle, we know base & perpendicular are 300 & 400 'cause 500 is the longest side which is hypotenuse 

Now, Area of a triangle = ab/2 = (300)(400)/2 = 120000/2 = 60000

As cost for 1 ft² = $0.60
cost for 60000 ft² = 60000 * 0.60 = $36000

In short, Your Answer would be Option A

Hope this helps!
8 0
4 years ago
Read 2 more answers
The product of my number and twice my number is 128. what is half my number
krok68 [10]
Answer=4

8*16=128
your number is 8
therefore half your number is 4
8/2=4

3 0
3 years ago
Read 2 more answers
In a game show, contestants gain or lose points by answering questions. Jacob began with 27 points, then he lost 53 points and g
tatuchka [14]

Answer:

His final score was -11 points

Step-by-step explanation:

27 - 53 = -26

-26 + 15 = -11

4 0
3 years ago
1)What value for y makes the equation 2(y-4)+8=12+y true?
NemiM [27]

Answer:

1. Option B- y=12

2. Option D - 2

Step-by-step explanation:

1. 2(y - 4) + 8 = 12 + y

  2y - 8 + 8 = 12 + y

add like terms -8 + 8 is 0 so

2y = 12 + y

Subtract y

1y = 12

Divide by 1

y= 12

2. -4(2) - 6  > -14

    -8 - 6 > -14

      -14 > -14

    This is not true because -14 is not greater than -14, they are equal.

Hope this helps.

5 0
3 years ago
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