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Rama09 [41]
2 years ago
10

Helppppppp meeeeeeeeee

Mathematics
1 answer:
Ivanshal [37]2 years ago
6 0
The answer should be 3 and 48
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a mechanic worked 20 hours. another mechanic worked 15 hours. together they charged a total of $1950. what was the rate charged
Natasha_Volkova [10]

Answer: The mechanics both charged $70 and $45 per hour respectively

Step-by-step explanation: We shall start by calling the mechanics hourly rates x and y respectively. So if one worked for 20 hours and charged 20 times x dollars, and the other one worked for 15 hours and charged 15 times y dollars, totalling 1950 dollars, we can write the following expression,

20x + 15y = 1950

Also, if the sum of the two rates was 115 dollars, that means for working for an hour only, they both would earn

x + y = 115

We now have a pair of simultaneous equations

20x + 15y = 1950 --------(1)

x + y = 115 ------------------(2)

We shall use the substitution method for this problem.

From equation (2), make x the subject of the equation

x = 115 - y

Substitute for the value of x into equation (1)

20(115 - y) + 15y = 1950

2300 - 20y + 15y = 1950

By collecting like terms we now have

2300 - 1950 = 20y - 15y

(Note that when a negative value crosses to the other side of the equation, it becomes a positive value and vice versa)

350 = 5y

Divide both sides of the equation by 5

70 = y

We now substitute for the value of y into equation (2)

x + y = 115

x + 70 = 115

Subtract 70 from both sides of the equation

x = 45.

Therefore, the rate they charged per hour were $45 and $70 respectively.

7 0
3 years ago
What is the answer to this problem?
valkas [14]

Answer:

60

Step-by-step explanation:

DEF=180

DE=120

180-120=60

i hope this helps

5 0
3 years ago
I don't know how to do the middle one or how to show work
pogonyaev
Can you take another pic of it because it is blurry 
5 0
3 years ago
PLEASE HELP !!!!!!!!
Aloiza [94]
275 is the answer to the question
8 0
3 years ago
Which is the simplified form of r^-7 + s^-12
makkiz [27]

Answer:

The simplified form of r^-7 + s^-12 is ----> 1/r^7 + 1/s^12

Step-by-step explanation:

3 0
3 years ago
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