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Reil [10]
3 years ago
5

ass="latex-formula">
​
Mathematics
2 answers:
Katyanochek1 [597]3 years ago
7 0
78 is the answer because if you take 13 groups of people but in each group there were 6 people then there in total 78 people
Maksim231197 [3]3 years ago
6 0
The answer to your question is 78
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two mechanics worked on a car. The first mechanic worked for 10 hours, and the second mechanic worked for 5 hours. Together they
Lerok [7]
Let's make,
mechanic #1's rate = x
mechanic #2's rate = y

* Their rate is dollars per hour ($/hr)

mechanic #1 worked for 20 hours (hr × $/hr = $)
20x = money earned by mech#1

and mechanic #2 worked for 5 hours
5y = money earned by mech#2

together they charged a total of $1150. So the amount of money earned by both mechanics.

20x + 5y = 1150

the sum of the two rates was $95 per hour.

x + y = 95

which means
x = 95 - y

plug (95 - y) in for "x" in the other equation to get everything in terms of one variable.

20(95 - y) + 5y = 1150

solve for y

1900 - 20y + 5y = 1150
1900 - 15y = 1150
-15y = 1150 - 1900
-15y = -750
y = -750/-15
y = 50 $/hr

Now use this to solve for x

x + y = 95
x + 50 = 95
x = 95 - 50
x = 45 $/hr

mech#1 charged 45$/hr
mech #2 charged 50$/hr
7 0
3 years ago
Norah has $50,000 to invest. She is considering two investment options. Option A pays 1.5% simple interest. Option B pays 1.4% i
NikAS [45]

Answer:

<u>Option A</u>

5 years: $53,750

10 years: $57,500

20 years: $65,000

<u>Option B</u>

5 years: $53,599

10 years: $57,458

20 years: $66,028

6 0
3 years ago
Read 2 more answers
6x2 + 15x – 21<br> no clue
Gala2k [10]

Answer:

-303

Step-by-step explanation:

.............

7 0
3 years ago
There are 10 boys and 12 girls in the tennis club. The coach wants to select two players to practice first. Which statements are
Sidana [21]
Since there are 22 participants all in all. The possible combinations of the two picked for practice first is, 
                               22C2 = 231
The probability of picking one from each gender will be solved through the calculation below.
                              (10C1)x(12C1) / 231 = 40/77
In percentage, the answer would be approximately 52%. Thus, the answer is the first choice. 
6 0
3 years ago
Read 2 more answers
Which expressions are equivalent to g + h + (j + k)? Check all that apply.
Paha777 [63]

Answer:

3.

{ \tt{g + h + (j + k)}} \\  = (g + h) + j + k

5 0
3 years ago
Read 2 more answers
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