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4 years ago

If 60 equals twice a number added to itself, find the number.

Mathematics

1 answer:

muminat4 years ago

8 0

write it into a formula

60=2x+x

60=3x

20=x

then double check 20 *2 = 40 +20 = 60

so the number is 20

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One house sitter charges $40 a day. Another house sitter charges an initial fee of $100 plus $15 per day. After how many days is

deff fn [24]

Answer:

Step-by-step explanation:

40 x 4 = 160

100 + (15 x 4) = 160

15x4=60, btw

4 0

3 years ago

The formula for any geometric sequence is a n = a 1 · r n - 1 , where a n represents the value of the nth term, a 1 represents t

AfilCa [17]

Answer:

Step-by-step explanation:instead, try making the subscripts and superscripts stand out:

n-1

a = a * r

n n-1

Believe me, it's worth the extra work to do this!!

Given the sequence -3, -6, -12, -24, you can easily see that the first term,

a is -3. The common factor is 2. Note how (-3)*2=-6, and so on.

So, a = -3 and r=2.

So the formula for this geometric sequence is

n-1

a = -3*2

8 0

3 years ago

Read 2 more answers

SELECT ALL the expressions that are equivalent to -2(4 - 3x) + (5x - 2)

erma4kov [3.2K]

Answer:

Option B, c and e are the correct

7 0

3 years ago

Two cylinders are similar. The surface area of one is 49 cm ^ 2 , and the surface area of the other is 121 cm ^ 2 . Find the sca

dalvyx [7]

Answer:

7 : 17.29

Step-by-step explanation:

==>Given:

Two similar cylinders:

Surface area of Cylinder A = 49cm²

Surface area of Cylinder B = 121cm²

==>Required:

Scale factor between both cylinders

==>Solution:

We can easily get the scale factor between both by taking the following steps:

=>Set up a ratio of their surface area:

Smaller cone surface area : larger cone surface area

49:121

= 49/121

=>Simplify the ratio gotten:

Dividing the denominator and the numerator by 7, would give us,

7/17.29

= 7:17.29

8 0

3 years ago

Read 2 more answers

Check MyAnswer Please!!!

jok3333 [9.3K]

The equation $x^2-9y^2=900$ <span>defines a hyperbolic cylinder.
</span>
1. Divide the equation $x^2-9y^2=900$ by 900:
$\dfrac{x^2}{900} - \dfrac{y^2}{100} =1$ .
This is the equation of conic section when z=0 (or z=const) and that is hyperbola equation.

2. To find the domain and the range you should express y:
$\dfrac{y^2}{100} =\dfrac{x^2}{900} - 1 \\ \\ y^2= \dfrac{x^2}{9} -100 \\ \\ y=\pm \sqrt{\dfrac{x^2}{9} -100}$ .
Since you have square root,
$\dfrac{x^2}{9} -100\ge 0 \\ x^2-900\ge 0 \\ (x-30)(x+30)\ge 0 \\ x\in(-\infty,-30)\cup (30,\infty)$ . This is the domain, the range is $y\in (-\infty,\infty)$ .

5 0

3 years ago