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soldier1979 [14.2K]
3 years ago
5

Evaluate the expression below if b=4 and c= -7. 2b -(c + b)

Mathematics
2 answers:
kow [346]3 years ago
6 0
The answer is 11 b/c
The equation is ~ 2(4)-(-7+4) =11
KIM [24]3 years ago
4 0
(-7c + 4b) + 2b (-7c - 6b) = -1
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The harbormaster wants to place buoys where the river bottom is 20 feet below the surface of the water. Complete the absolute va
Natalija [7]

Answer:

The answer is below

Step-by-step explanation:

The bottom of a river makes a V-shape that can be modeled with the absolute value function, d(h) = ⅕ ⎜h − 240⎟ − 48, where d is the depth of the river bottom (in feet) and h is the horizontal distance to the left-hand shore (in feet). A ship risks running aground if the bottom of its keel (its lowest point under the water) reaches down to the river bottom. Suppose you are the harbormaster and you want to place buoys where the river bottom is 20 feet below the surface. Complete the absolute value equation to find the horizontal distance from the left shore at which the buoys should be placed

Answer:

To solve the problem, the depth of the water would be equated to the position of the river bottom.

d(h)=river \ bottom\\\\The \ river \ bottom=-20\ feet(below)\\\\d(h) = -20\\\\\frac{1}{5}|h-240|-48=-20\\ \\\frac{1}{5}|h-240|=-20+48\\\\\frac{1}{5}|h-240|=28\\\\|h-240|=28*5\\\\|h-240|=140\\\\h-240=140\ or\ h-240=-140\\\\h=140+240\ or\ h=-140+240\\\\h=380\ or\ h=100\\\\The\ buoys\ should\ be\ placed\ at\ 100\ feet\ and\ 380\ feet\ from\ left-hand\ shore

4 0
3 years ago
Reuben drove 260 miles using 12 gallons of gas. At this rate, how many gallons of gas would he need to drive miles
KATRIN_1 [288]

Answer:

286 miles / x gallons = 15miles per gallon.

286/15 = x = approximately 19.07 gallons.

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
Can someone pls help for brainlest
ch4aika [34]
Answer:
455 square kilometers
step-by-step explanation:
a = l • w
24 • 24
576
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11 • 11
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576 - 121
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5 0
2 years ago
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Gnom [1K]

Answer:

1.8 gallons would be used.

Step-by-step explanation:

TOTAL AREA TO BE PAINTED:

     2 x 10 x 20  +   2 x10x 16 = 720 ft2

720 ft2 / 400 ft2 /gal = 1.8 gal  

7 0
2 years ago
A farmer sells 6.3 kg of apples and pears at the farmers .2/5 of this weight is apples and the rest is pears. How many kg of pea
Studentka2010 [4]

Answer:

4.8/5

Step-by-step explanation:

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