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Airida [17]
3 years ago
6

PLZ PLZ PLZ Solve this

Mathematics
2 answers:
dolphi86 [110]3 years ago
6 0
....................

Fynjy0 [20]3 years ago
4 0
45/24, 3/8, 18/110 :)
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The mean score on a set of 17 test is 72. Suppose two more students take the test and score 68 and 63. What is the new mean?
Masja [62]

Answer:

New mean=71.32

Step-by-step explanation:

The expression for the total initial score is;

T=M×S

where;

T=total initial score

M=mean score

S=number in the set

replacing;

T=unknown

M=72

S=17

replacing;

T=72×17=1,224

The total initial score=1,224

Determine the total score by;

total score=total initial score+total final score

where;

total initial score=1,224

total final score=(68+63)=131

replacing;

total score=1,224+131=1,355

Determine the new mean;

New mean=total score/new number

where;

total score=1,355

new number=(17+2)=19

replacing;

new mean=1,355/19=71.32

8 0
3 years ago
— 12 – 6р – (-2)<br> help pls
baherus [9]

Answer: -6P - 10

Step-by-step explanation:

STEP 1.   -12 - 6P + 2

STEP 2.   -6P + ( -12 + 2 )

STEP 3.   -6P - 10

8 0
2 years ago
2. Sam has two part-time jobs, delivering pizza and mowing lawns. He makes $9/hr delivering pizza and $7/hr mowing lawns. Last w
frutty [35]

Answer:

<h2>22 hours and 10 hours </h2>

Step-by-step explanation:

let the jobs be x and y, so that

x+y=32--------1

9x+7y=248----2

x=32-y

substitute x=32-y for x in equation 2 we have

9(32-y)+7y=248

open bracket we have

288-9y+7y=248

-2y=248-288

-2y=-40

2y=40

divide both sides by 2 we have

y=40/2

y= 10 hours

subtitute y=10 for y in equation 1 to find x

x+10=32--------1

x=32-10

x=22

x=22 hours

4 0
3 years ago
Every employee works 7 hours per day. every employee works 5 days per week. every employee works 49 weeks per year. how many day
andriy [413]
To determine the number of days that an employee work in a week, we simply use dimensional analysis and multiplying the number of works per week with the number of weeks in total for a year. That is,
                         employee works = (5 days per week)(49 weeks per year) 
                                                    =245 days
4 0
3 years ago
Read 2 more answers
Bryan estimates the cost of a vacation to be $730. The actual cost of the vacation is $850. Find the percent error. Round the ne
Ray Of Light [21]
The answer is negative. You subtract 730 from 850
8 0
3 years ago
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