2x^2-x-21= Pls help asap

Gennadij [26K]

You and three of your friends means that there are four people to divide by. In the first month 438/4= 109.5 each. The total profit per person over two months is 184. 184-109.5=74.5 dollars each from the second month. Multiply by four to see how much profit was made total. 74.5x4=298

4 0

3 years ago

Find the surface area of the cylinder to the nearest whole number. The figure is not drawn to

Anettt [7]

Answer:

correct option is 2187

Total surface area is 2,185.44 square inches.

lateral surface area is 640.56 square inches

Step-by-step explanation:

Given

radius of cylinder = 12 inches

height of cylinder = 17 inches

we will us value of pi as 3.14

surface area for cylinder consist of two part

1. lateral surface area which is gven by $2\pi rl$

where r is radius of cylinder and l is height of cylinder

Thus, lateral surface area for given cylinder is

$2\pi rl\\ =>2* 3.14*12*17\\=> 1281.12$

Thus, lateral surface area for given cylinder is 1281.12 square inches.

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second part of surface area is area of two base (upper and lower) of cylinder.

area of base is given by area of circle $\pi r^2$

$area \ of \base = \pi r^2 = 3.14*12^2\\=>area \ of \base = 3.14*144 = 452.16$

This, area of base is for one base of cylinder

since there are 2 base

area of both base will be = 2* area of one base

= 2*452.16 = 904.32.

Thus, area of base is 904.32 sq. in.

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Total surface area of cylinder = area of two base+ lateral surface area of cylinder = 1281.12 square inches + 904.32 square inches

= 2,185.44 square inches.

Thus, total surface area is 2,185.44 square inches.

lateral surface area is 640.56 square inches

but option which is closest to calculated value is 2187.

Thus, correct option is 2187

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Note: this problem can be directly solved using formula

total surface area for cylinder = $2\pi r^2 + 2\pi rl$

5 0

3 years ago

Recall the equation that modeled the volume of the raised flower bed, y, in terms of the width of the box, y = x3 + 11x2 − 312x.

lakkis [162]

Answer:

48 cubic feet of mulch

Step-by-step explanation:

12 feet long x 4 feet wide x 1 foot deep of mulch= 48 cubic feet of mulch

8 0

3 years ago

What is the solution

Umnica [9.8K]

-3x + y = 4

Solve for y

y = 3x + 4

Plug this y value into the other equation.

-9x + 5y = -1

-9x + 5(3x + 4) = -1

Distribute 5(3x + 4)

-9x + 15x + 20 = -1

Subtract 20 from both sides

-9x + 15x + 20 - 20 = -1 - 20

-9x + 15x = -21

Combine like terms

6x = -21

Divide both sides by 6

6/6 x = -21/6

1x = -21/6

x = -7/2

x = -3.5 or -7/2

Plug this value into an equation to solve for y.

-3(-3.5) + y = 4

10.5 + y = 4

Subtract both sides by 10.5

10.5 - 10.5 + y = 4 - 10.5

y = -6.5

Check this answer by plugging the value of x into the other equation.

-9(-3.5) + 5y = -1

31.5 + 5y = -1

Subtract both sides by 31.5

31.5 - 31.5 + 5y = -1 - 31.5

5y = -32.5

Divide both sides by 5

y = -6.5 or -13/2

Therefore the solution is ( -3.5 , -6.5 )

8 0

3 years ago

Angel ate 2/3 of the chicken wings that were on the platter. How many chicken wings were on the platter if he ate 8 wings?

borishaifa [10]

Answer:

12

Step-by-step explanation:2/3 of 12 =8

3 0

4 years ago