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Varvara68 [4.7K]
3 years ago
12

a boat going upstream at 4 mph then travels downstream at 10 mph. what is the rate of the boat in still water​

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

Answer:

7 mph

Step-by-step explanation:

If b is the rate of the boat, and s is the rate of the stream, then:

b − s = 4

b + s = 10

Solve the system of equations with substitution or elimination.  Using elimination, add the equations together:

2b = 14

b = 7

The boat's rate is 7 mph.

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Delta Math: Angle Terminology with Equations
vazorg [7]

Answer:

m∠A = 139°

Step-by-step explanation:

Since knowing that:

Supplementary angles = 180 degree

Thus we put that in both equation:

( 7x - 15 ) + ( 2x - 3 ) = 180

Combine like terms & use inverse operations to find the value of x:

( 7x - 15 ) + ( 2x - 3 ) = 180

9x - 18 = 180

9x - 18 + 18 = 180 + 18

9x  = 198

9x/9 = 198/9

x = 22

Hence,  Angle A will have a measure of 7x - 15 which means  7 ×  22 -15 = 154 - 15 = 139°

m∠A = 139°

The measure of Angle B will be 2x - 3 = 2 • 22 - 3 = 44 - 3 = 41°

m∠ B = 41°

Check Answer by add 139 and 31 which equal 180

<u><em>~lenvy~</em></u>

3 0
2 years ago
Negative 12 - negative 50
seraphim [82]

Answer:

38

Step-by-step explanation:

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5 0
2 years ago
HELP! if you get it right I’ll give brainliest!!!
lakkis [162]

Answer:

slope intercept i think

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Julia has 2 identical rooms in her house. If each room measures 8 feet on one side and 12 feet on another, what is the total are
levacccp [35]
L = 12 ft
W = 8 ft
One room has area:
A1 = L · W = 12 · 8 = 96 ft²
The total area of rooms:
A = 2 · 96 = 192 ft² 
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