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S_A_V [24]
4 years ago
13

Help I do not understand

Mathematics
1 answer:
Lady_Fox [76]4 years ago
5 0
To find the solution of the system of equations, you need to find the coordinates of where the two graphs intersect. In this case they intersect at two points which are (-1,0) and (4,-5).
You might be interested in
06. Kristen can run at 15km/hr and walk at 5 km/hr. She completed a 42 km marathon in 4 hours. What distance did Kristen run dur
Mrac [35]
Let x be the time she ran and y be the time she walked 

then distance ran =  25x and distance walked = 5y 

so 15x + 5y = 42

and x + y = 4

* second equn. by -5:-

-5x - 5y = -20

add this to the first equn:0

10x = 22
x = 2.2

distance she ran = 2.2 * 15  =  33 km
7 0
3 years ago
HELP!! I desperately need help!! I would appreciate if you could show work please!!!
zzz [600]

Answer:

a) 137.9°

b) 12.2° (please refer to explanation because I didn't know what to round to)

Step-by-step explanation:

1a) A supplementary angle will equal 180°, so you must subtract 42.1 from 180

180-42.1 = 137.9

1b) A complementary angle will equal 90°, so you need to use the expression given and add an x for the other part of 90°

8x-20+x = 90

9x-20=90

9x=110

x=12.2

7 0
3 years ago
You are painting your two car garage, including the door. The walls measure 12 feet by 12 feet, with a 10-foot ceiling. How many
DENIUS [597]

Answer:

1.2 gallons

Step-by-step explanation:

We assume that each room is rectangular with four walls and no doors. If the dimensions are length l, by width w with height h, then there are two walls with area l*h and two walls with w*h.

The total area of the room is thus: 2lh + 2wh = 2h(l+w).

l = 12ft, w = 12ft, h = 10ft  (all given)

Area of walls = 2h(l+w) = 2*10(12+12)

Area = 2*10*24 = 480 square feet

Each gallon of paint covers 400 square feet. So, you will need to buy

480 / 400 = 1.2 gallons

You will need to buy 2 gallons

5 0
3 years ago
A standard roulette wheel has 38 numbered slots for a small ball to land in: 36 are marked from 1 to 36, with half of those blac
Anastasy [175]

Answer:

The expected value of betting $500 on red is $463.7.

Step-by-step explanation:

There is not a fair game. This can be demostrated by the expected value of betting a sum of money on red, for example.

The expected value is calculated as:

E(G)=\sum p_iG_i

being G the profit of each possible result.

If we bet $500, the possible outcomes are:

- <em>Winning</em>. We get G_w=$1,000. This happens when the roulette's ball falls in a red place. The probability of this can be calculated dividing the red slots (half of 36) by the total slots (38) of the roulette:

P(R)=R/T=18/38\approx0.4737  

- <em>Losing</em>. We get G_l=$0.  This happens when the ball does not fall in a red place. The probability of this is the complementary of winning, so we have:

P(not \,R)=1-P(R)=1-18/38=20/38\approx 0.5263

Then,  we can calculate the expected value as:

E(G)=\sum p_iG_i=p_wG_w+p_lG_l=0.4637*1,000+0.5263*0=463.7

We expect to win $463.7 for every $500 we bet on red, so we are losing in average $36.3 per $500 bet.

4 0
3 years ago
Using pemdas please
adell [148]

Answer:

60

Step-by-step explanation:

5²= 10

10x3=30

90-30=60

7 0
3 years ago
Read 2 more answers
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