All categories

2 years ago

Do 4x and 15 + x have the same value if x is 5?

Mathematics

1 answer:

Cerrena [4.2K]2 years ago

4 0

Yes because 4 times 5 is 20 and 15 + 5 is 20

You might be interested in

X to the third plus x minus 7 equals -3 square root of x - 1

Ugo [173]

Answer:

x ≈ 1.5004

Step-by-step explanation:

We suppose your equation is ...

$x^3+x-7=-3\sqrt{x-1}$

Squaring both sides and subtracting the right side gives ...

$x^6 +2x^4 -14x^3 +x^2 -23x +58 = 0$

This 6th-degree equation has two positive real roots, near x=1.5, and x=2. The root at x=2 is extraneous. The one near x=1.5 is irrational.

5 0

2 years ago

Brittany's family is driving at a speed of 45 miles per hour. If x represents the distance they have traveled and y represents t

Anit [1.1K]

X=45y
x is distance and y is the time the car goes 45 miles per hour so distance equals 45 times time

6 0

2 years ago

Read 2 more answers

2 years ago, father age was nine times the son age but 3 years later it will be 5 times only. find the present ages of the fathe

Goshia [24]

Answer:

The Father is currently 47 and the Son is 7

Step-by-step explanation:

Let F and S be the present ages of Father and Son, respectively.

We are told that (F-2) = 9(S-2) [2 years ago, father age was nine times the son age]

We also learn that (F+3) = 5(S+3) [3 years later it will be 5 times only]

Take the first expression and isolate one of the variables (S or F). I'll isolate F:

(F-2) = 9(S-2)

F = 9S - 16

Now use this in the second expression:

(F+3) = 5(S+3)

((9S-16)+3) = 5(S+3)

9S-13 = 5S+15

4S = 28

S = 7

Since F = 9S-16,

F = 9*(7)-16

F = 47

Father is 47 and Son is 7

CHECK:

Was the father 9 times the age of his son 2 years ago?

Father would have been 45 and son 5. Yes, 9*5 = 45

In 3 years will he be 5 times older than his son? Yes, Father would be 50 and son would be 10. 5*(10) = 50

3 0

1 year ago

The circumference of a bowling ball is 8pi in. Find the surface area of the bowling ball. Express your answer in terms of pi.

MrRa [10]

Surface area of a sphere (3D solid's name for ball shaped object) is given by

$SA = 4 \pi r^{2}$

We do not know the radius of the sphere but we can work it out from the circumference $8 \pi$

$Circumference = 2 \pi r$
$8 \pi =2 \pi r$
$r= \frac{8 \pi }{4 \pi }=2$

then
$SA=4 \pi (2)^{2} =16 \pi$

7 0

2 years ago

What does x equal x^3 = -15

gtnhenbr [62]

Answer: $x=\sqrt[3]{-15}$

Step-by-step explanation:

x^3 = -15

$x=\sqrt[3]{-15}$

4 0

2 years ago