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Mathematics

1 answer:

creativ13 [48]2 years ago

8 0

Answer:

55.4176955.4176955.4176955.41769

Step-by-step explanation:

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Find 3x-y-3z if x=-2, y= 1, z=-2

Delicious77 [7]

Basically just substitute

3(-2)-1-3(-2) = -6-1+6 = -1

The answer is -1.

4 0

3 years ago

A boat travels 105 km downstream in 5 hours. The return trip upstream takes 7 hours. Find the speed of the boat in still water a

notsponge [240]

Speed of the boat = u
speed of the current = v

in downstream,
u - v = 105/5
u - v = 21

in upstream
u + v = 105/7
u + v = 15

add both equations
2u = 36
u = 18

v = -3

so
speed of the boat = 18 km/h
speed of the current = 3 km/h

4 0

2 years ago

Solve the system of equations using a matrix X+3y=5 X+4y=6

shusha [124]

Answer:

x=2 and y=1

Step-by-step explanation:

if y is 1 then u can multiply the three and 4 which is the same and then add 2 which add up to 5 and 6

7 0

3 years ago

The following table shows the estimated populations and annual growth rates for four countries in the year 2000. Find the expect

Liula [17]

Answer:

After 25 years the population will be:

Australia: 22271200
China: 1580220878
Mexico: 157380127
Zaire: 112794819

Step-by-step explanation:

Growth rate problem that has a growth rate proportional to the population size can be solved using the equation:

P(t) = P₀eʳᵗ

t is your unit of time. It could be days, or hours, or minutes. It changes depending on each problem. In this problem, t is measured in years because you're jumping from 2000 to 2025. Years just makes the most sense to measure that leap in time.

P(t) is the population at time t. An example in this problem could be P(20) would be the population 20 years after the initial count. or maybe P(12) would be the population 12 years after the initial count. or P(0) would be the initial count of the population.