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hammer [34]
3 years ago
15

Evaluate d – f if d = 7 and f = –15

Mathematics
2 answers:
KonstantinChe [14]3 years ago
3 0

Answer:

The answer is 22!!!!!!!

Montano1993 [528]3 years ago
3 0

Answer:

22

Step-by-step explanation:

d – f

Let d = 7 and f = -15

7 - -15

7+15

22

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An antique store increases all of its prices by $40\%$, and then announces a $25\%$-off-everything sale. What percent of the ori
Mandarinka [93]

Answer:

105%

Step-by-step explanation:

We'll analyse the question one step at a time

Let the original price be x.

Let y be the 40% increase

y =x + 40\% *x

Express as decimal

y =x + 0.40 x

y =1.40x

Let z be the 25% off sale

z = (1 - 25\%) * y

Express as decimal

z = (1 - 0.25) * y

z = (0.75) * y

z = 0.75y

Substitute 1.40s for y

z = 0.75*1.40x

z = 1.05x

Express 1.05 as a fraction

z = 105\%  * x

<em>The percentage is 105%</em>

5 0
3 years ago
Which equation describes a line with a slope of -8 and includes the point (-4, 7)?
timurjin [86]
Such an equation would be y + 8x = - 25 (standard form) OR y = -8x - 25 (y-intercept form)
 
Deriving The Answer:

By using the point-slope form of the equation of a line, by knowing the gradient of that line and a point on that line, the equation of this line can be derived.

Now, the point-slope form exists as y - y₁ = m ( x - x₁)

since slope = -8 and the point on the line = (-4 , 7)

Then m = - 8
          x₁ = - 4
          y₁ =  7
                              ⇒  y - 7 = -8 ( x - (-4))

                              ⇒ y - 7 = -8x - 32

                              ⇒ y + 8x = - 25
                   


3 0
3 years ago
What is the area of a sector with a central angle of 3pi/5 radians and a diameter of 21.2cm
Elenna [48]
Answer: 105.84 cm^2

To find the answer, first you have to start by finding the percent of the circle in the sector. Convert the radians given to 108 degrees. 108 out of 360 is 30%. 

Now, find the area of the circle. It's pi x r^2, so the area is 352.810.

Multiply this by 30% to find our area of 105.84 cm^2
8 0
3 years ago
The quotient of two and a number, subtracted from 17
Vilka [71]
The quotient means divide

17 - (2/n) <== ur expression
4 0
3 years ago
Read 2 more answers
Expand the expression: 7(10s-10)
olga nikolaevna [1]

Answer: 70s - 70

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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