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3 years ago

Please help :) :) :)

Mathematics

1 answer:

Hatshy [7]3 years ago

7 0

A motorboat travels 222 km in 6 hours going upstream.
Rate = distance/time = 222/6 = 37 km/hr
----------------------
It travels 390 km going downstream in the same amount of time.
Rate = distance/time = 390/6 = 65 km/hr
---------
What is the rate of the boat in still water and what is the rate of the current?
Equations:
Upstream: b-c = 37 km/hr
Downstrm: b+c = 65 km/hr

Add and solve for "b":
(2)b = 102 km/hr
b = 51 km/hr (speed of the boat in still water)
-----
Solve for "c":
b+c = 65
51 + c = 65
c = 14 km/hr (speed of the current)

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Factorize (2a-b)^2 -4(2a-b) -13

SpyIntel [72]

Answer:

Hello!

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(2a-b)^2 -4(2a-b) -13 =

$v = 4a^{2} - 4ab + b^{2} - 8a +4b - 13$

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Step-by-step explanation: All you have to do is Factor the polynomial.

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6 0

3 years ago

Frieda paid $132 for groceries for her family. This was 1 1/8 as much as she paid for the previous time she shopped. How much di

schepotkina [342]

Answer:

$117.33

Step-by-step explanation:

1 1/8 = 1 + 1/8 = 8/8 + 1/8 = 9/8

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Let the amount she paid last time equal x.

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She paid $117.33

7 0

3 years ago

Use the following information:

Anastasy [175]

Answer:

n(U) = 20
n(A) = 8
n(B) = 5
n(A'∪B) = 15

Step-by-step explanation:

For these sets, it is easy enough to list the elements and count them.

U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}

n(U) = 20

A = {1, 3, 5, 7, 9, 11, 13, 15}

n(A) = 8

B = {7, 11, 13, 17, 19}

n(B) = 5

A'∪B = {2, 4, 6, 7, 8, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20}

n(A'∪B) = 15

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3 years ago

Can someone please help me out

alekssr [168]

For the equation Y value is -45.

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3 years ago

Find the measure of < FGE. please provide step by step equation

Triss [41]

Answer: 62 degrees

Step-by-step explanation:

.130-180=50

.16x+4+14x+6+50=180

.180-4-6-50=120

.16x+14x=120

.30x=120

.x=4

.14(4)+6

.56+6

.62

4 0

3 years ago