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4 years ago

If fifty-seven is added to four times a number, the result is -7. What is the number?

Mathematics

2 answers:

Andrei [34K]4 years ago

8 0

Answer:

x = -16

Step-by-step explanation:

4x + 57 = -7

subtract 57 to both sides and then solve for x

4x+ 57 -57 = -7 + -57

4x = -64

4x/4 = -64/4

x = -16

Ierofanga [76]4 years ago

7 0

Answer:

x(aka the number) = -16

This is because 4 times -16 = -64, and -64 plus 57 = -7.

Step-by-step explanation:

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4 years ago

Evaluate the following integral over the specified region. Assume (r comma theta )(r,θ) are polar coordinates. ModifyingBelow In

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Answer:

Step-by-step explanation:

We have to integrate the function

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So we get the integral as

$\int \int _R (16+x^2+y^2)^2 dxdy\\= \int\limits^3_0 \int\limits^\pi_0( {16+r^2}^2) (r)drdt\\ =(t) (\frac{(16+r^2)^3}{6}$

Substitute the limits to get

Answer

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4 years ago

Which mixed number is equal to 6.5?

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3 years ago

John has decided to prepare an old field for his son's new horse. the length of the field is 10 meters less than 4 times its wid

tatuchka [14]

Answer: The total money invested in the field will be $1,623.80

Step-by-step explanation:

step 1

Find the dimensions of the field

Let

x -----> the length of the field

y -----> the width of the field

p=2(x+y)

p(4.80)=1,584

p=330m

we know that

The perimeter of the field is equal to

330=2(x+y)----> equation A

x=4y-10 ------> equation B

substitute equation B in equation A and solve for y

330=2(4y-10+y)

165=(5y-10)

5y=165+10

y+35

Find the value of x

x=4(35)-10+130

therefore

The length of the field is 130 meters and the width of the field is 35 meters

step 2

Find the area of the field

The area of the field is

A=xy

substitute

A=(130)(35)=4,550m2

step 3

Find the number of bags of seed

Divide the area by 460

4,550/460=9.89 bags

Round up to the nearest whole number

9.89 bags=10 bags

step 4

Find the cost of the seed

(10 )(3.98)=$19.8

step 5

Find the total money invested in the field

1,584+$39.8=$1,623.80

7 0

2 years ago

Read 2 more answers