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Vedmedyk [2.9K]
4 years ago
15

5a+7=4a+4 solve for a.​

Mathematics
2 answers:
stich3 [128]4 years ago
8 0

Answer:

a=-3

Step-by-step explanation:

Combine the variable: 5a+7=4a+4

Combine the constants: a+7=4

a=-3

Zarrin [17]4 years ago
3 0

Answer:

5a+7=4a++4

solution

54-4a=4-7

a= -2

1a/1=-2/1

a=-2

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The graph shows the distance traveled by an Olympic-level sprinter over time during a race.
sweet [91]

Answer:

l

Step-by-step explanation:

8 0
3 years ago
Need an answer for question 7 HURRY PLEASE 20 POINTS
Andrei [34K]

Answer:

2x^2 = 6x - 5.

-x^2 - 10x = 34.

These have only complex roots/

Step-by-step explanation:

3x^2 - 5x = -8

3x^2 - 5x + 8 = 0

There are complex roots if the discriminant  9b^2 - 4ac) is negative.

Here the discriminant D = (-5)^2 - 4*-5*8 = 25 + 160

This is positive so the roots are real.

2x^2 = 6x - 5

2x^2 - 6x + 5 = 0

D = (-6)^2 - 4*2*5 =  36 - 40 = -4

So this has no real roots only complex ones.

12x = 9x^2 + 4

9x^2 - 12x + 4 = 0

D = (-12)^2 - 4*9 * 4 = 144 - 144 = 0.

- Real roots.

-x^2 - 10x = 34

x^2 + 10x + 34 = 0

D = (10)^2 - 4*1*34 = 100 - 136 = -36.

No real roots = only complex roots.

7 0
3 years ago
Jacob has several babysitting jobs. On one job, he earned $10 an hour plus an extra $20 since there were 3 children. On the othe
Slav-nsk [51]

Answer:

4 hours, $60

Step-by-step explanation:

Assuming "d" is equal to the dollars Jacob earned and h= hours, you start by setting the equations equal to each other, since both are equal to "d."

15h=10h+20

Subtract 10h from both sides (to combine like terms) so the equation becomes:

5h=20

Divide 5 from both sides, to isolate "d" :

h=4

The number of hours Jacob worked is 4, as the equation above shows. To find the amount of money Jacob made, substitute 4 as "h" into the two original equations:

d= 15(4) d=$60

d=10(4)+20 d=$60

Jacob earned $60 dollars in 4 hours.

7 0
3 years ago
Emily washes a car in 6 minutes. Larissa can wash that same car in 8
Arisa [49]
It takes Emily 6 minutes to wash the car. This means he washes 16
1
6
of the car per minute.Larissa therefore washes 18
1
8
of the car per minute. Working together, they both wash 16+18
1
6
+
1
8
of the car, or 724
7
24
of the car each minute. This means that it takes 247
24
7
minutes to wash the entire car — or 3 minutes, 25.714285... seconds total.
3 0
3 years ago
Jina made an international phone call for 4.5 minutes. She was charged $0.26 for each minute. Find the amount she paid.
tangare [24]

Answer:

$1.17

Step-by-step explanation:

$0.26*4.5= $1.17

5 0
3 years ago
Read 2 more answers
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