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PtichkaEL [24]
3 years ago
12

I need help plz will give brainliest!!!

Mathematics
1 answer:
Leokris [45]3 years ago
7 0

Answer:

18 red marbles

Step-by-step explanation:

Because the ratio of yellow marbles to red marbles is 1:6 in the population, the expected number of red marbles is 6 times the number of yellow marbles in the representative sample. there should be 18 red marbles.

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What is the value of the dicriminant Of f f(x)=-7x^2+8x+2
nignag [31]

Answer:

Step-by-step explanation:

discriminant=b²-4ac=8²-4(7)(2)=64-56=8

6 0
3 years ago
A water trough is 9 m long and has a cross-section in the shape of an isosceles trapezoid that is 20 cm wide at the bottom, 70 c
ella [17]

Answer:

dv = surface area * dh

so

dv/dt = surface area * dh/dt

width at surface = 40 + (80-40)(30/40)

= 40 + 30 = 70 cm = 0.70 m

so

surface area = 9 * .7 = 6.3 m^2

so

.3 m^3/min = 6.3 m^2 * dh/dt

and

dh/dt = .047 meters/min or 4.7 cm/min

Step-by-step explanation:

7 0
3 years ago
Please someone help and stop giving me links!!! No false answers!! Explanation
enyata [817]
Use the internet it helps a lot
7 0
3 years ago
Write and solve a system of equations for this question please
andre [41]
Let b and s be the velocity of the boat and stream respectively....

3(b-s)=27

b-s=9

b=9+s  we will use this in the second equation....

2(b+s)=30

b+s=15, now use b found above in this to get:

9+s+s=15

2s+9=15

2s=6

s=3, and since from earlier b-s=9, b=9+s so

b=12

So the speed of the boat is 12mph and the stream is 3 mph
6 0
3 years ago
The temperature at 9 a.m. is 2 degrees. The temperature rises 3 more degrees by noon. Which expression describes the temperature
Advocard [28]

Answer:

2 + 3

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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