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Sonja [21]
2 years ago
7

Help quickly!!!!! explanation needed. lots of points.

Mathematics
1 answer:
Usimov [2.4K]2 years ago
3 0

Answer:

29.3

Step-by-step explanation:

to find average you find the sum of all the minutes she practiced and divide it by the total amount of day she practiced.

first we have to find the sum of the minutes she practiced:

20+30+40+38+25+22+39+22+26+31

this equation is equal to 293 minutes she practiced in total. Now we have to divide this by the total amount of days she practiced whice according to the data is 10! So:

293/10 =29.3

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A system of two equations is shown.
Delvig [45]

Answer:

x=-2;y=-7

Step-by-step explanation:

y=5x+3

y=3x-1

3x-1=5x+3

-2x=4

x=-2 y=5x+3 y=5×(-2)+3 y=-7

8 0
2 years ago
Serenity Spa charges $59 for a one hour massage. They charge $0.95 per minute for each additional minute over an hour. If
Yanka [14]

Answer:

D. y = 0.8x + 79

Choices:

A.  

y = 79x + 0.8

B.  

y = -0.8x + 79

C.  

y = 79.8x

D.  

y = 0.8x + 79

5 0
3 years ago
Sarah brought her City car in for repairs and maintenance over the first three years she owned it she replace the brake pads in
Veseljchak [2.6K]

Answer: Average per year for the repairs and maintenance is $273.66

Step-by-step explanation:

She replace the brake pads in the third year for $98 and the preventive maintenance plan cost $723 

what did he average per year for repairs and maintenance?

The total cost of repairs and maintenance = 98 + 723 = 821

repairs and maintenance over the first three years 

Divide the answer by 3

821/ 3 = 273.67 dollars per year

3 0
2 years ago
find four solutions for the following linear equations your answer must include at least two positive numbers for X and at least
sattari [20]

9514 1404 393

Answer:

  (-18, 14), (-9, 9), (9, -1), (18, -6)

Step-by-step explanation:

Since there is a 9 in the denominator of the coefficient of x, we will get integer solutions only if x is a multiple of 9. Suitable values meeting the problem requirements are x ∈ {-18, -9, 9, 18}. Then the corresponding values of y are ...

  y = -5/9(-18) +4 = 10 +4 = 14

  y = -5/9(-9) +4 = 5 +4 = 9

  y = -5/9(9) +4 = -5 +4 = -1

  y = -5/9(18) +4 = -10 +4 = -6

The four solutions we have found are ...

  (-18, 14), (-9, 9), (9, -1), (18, -6)

4 0
2 years ago
H(t)= (t+3)^2 + 5
oee [108]

Answer:

The average rate of change for the given function in the interval (-5, -1) is 0 (zero)

Step-by-step explanation:

The average rate of change of a function over an interval is the quotient between the difference between the function evaluated at the ends of the interval divided by the length of the interval. That is for our case:

the average rte of change of h(t) in the interval (-5, -1) is:

\frac{h(-1)-h(-5)}{-1+5}

so we find:

h(-1)=(-1+3)^2+5=2^2+5=4+5=9\\and\\h(-5)=(-5+3)^2+5=(-2)^2+5=4+5=9

then the average rate of change becomes:

\frac{h(-1)-h(-5)}{-1+5}=\frac{9-9}{4} =\frac{0}{4} =0

5 0
2 years ago
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