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3 years ago

The sum of a number and 8 is 15

2 answers:

3 0

You mean, what is this number?

we can rephrase it like this: the sum of a number x and 8 is 15

which is:

x+8=15

we subtract 8 from both sides and we get
x=7

so the answer is 7.

densk [106]3 years ago

3 0

Let the missing number be known as 's'

s + 8 = 15

Subtract 8 from both sides of the equation.

s + 8 = 15
-8 -8
---------------------
s = 7.

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During a sale, a dress is marked down from a selling price of $80 to a sale price of $60. What is the percent markdown

Zanzabum

$80 x .25 = 20

$80-20=$60

25% markdown

5 0

3 years ago

What is 0.08 divided by 1.44

hammer [34]

0.08 divided by 1.44 is 0.055555556

6 0

3 years ago

Consider the following problem: a box with an open top is to be constructed from a square piece of cardboard, 3 feet wide, by cu

Alecsey [184]

Answer:

) See annex

b) See annex

x = 0,5 ft

y = 2 ft and

V = 2 ft³

Step-by-step explanation: See annex

c) V = y*y*x

d-1) y = 3 - 2x

d-2) V = (3-2x)* ( 3-2x)* x ⇒ V = (3-2x)²*x

V(x) =( 9 + 4x² - 12x )*x ⇒ V(x) = 9x + 4x³ - 12x²

Taking derivatives

V¨(x) = 9 + 12x² - 24x

V¨(x) = 0 ⇒ 12x² -24x +9 = 0 ⇒ 4x² - 8x + 3 = 0

Solving for x (second degree equation)

x =[ -b ± √b²- 4ac ] / 2a

we get x₁ = 1,5 and x₂ = 0,5

We look at y = 3 - 2x and see that the value x₂ is the only valid root

then

x = 0,5 ft

y = 2 ft and

V = 0,5*2*2

V = 2 ft³

7 0

3 years ago

MARK AS BRAINLEST

Ierofanga [76]

Answer:

Option C $3n^{2}+n-2$

Step-by-step explanation:

<u><em>Verify each expression</em></u>

case A) we have

$5n^{2}+6n-1$

In this expression the term of n is 6n

has a coefficient of positive 6

case B) we have

$2n^{2}-5n+1$

In this expression the term of n is -5n

has a coefficient of negative 5

case C) we have

$3n^{2}+n-2$

In this expression the term of n is n

has a coefficient of positive 1

case D) we have

$4n^{2}-n+9$

In this expression the term of n is -n

has a coefficient of negative 1

6 0

3 years ago

Two sisters, Lily and Suri, have been saving money for college for the past several years. At the end of the first year, each si

andriy [413]

Answer:

1st year:

Lily:20

Suri:20

2nd year

L:20*3=60

S:20+80=100

3rd year

L:60*3=180

S:100+80=180

4th year

L 180*3=540

S 180+80=260

It will take Lily 4 years to hve more money saved than Suri

Step-by-step explanation:

8 0

3 years ago