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Rufina [12.5K]
3 years ago
14

Two times the sum of a number and 4 equals 7.

Mathematics
1 answer:
soldier1979 [14.2K]3 years ago
8 0

Answer:

-1/2 or -.5

Step-by-step explanation:

2(n + 4) = 7

2n + 8 = 7

2n = -1

n = -1/2

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How many unique triangles can be made where one angle measures 60 degrees and another is an obtuse angle
Svet_ta [14]
An acute angle can also be made inside of that type of triangle.
4 0
4 years ago
Calculate the value of each expression:<br> (-8)•(-2/3)<br> SHOW YOUR WORK:
inna [77]

Answer: \frac{16}{3}

Step-by-step explanation:

For this exercise it is important to remember  the multiplication of signs:

(+)(+)=+\\(-)(-)=+\\(-)(+)=-\\(+)(-)=-

In this case, given the following expression:

(-8)(-\frac{2}{3})

You can idenfity that both factors are negative. Then, the product (The result of the multiplication) will be positive.

Then, in order to get the product, you need to multiply the numerator of the fraction by -8. So, you get:

 \frac{(-2)(-8)}{3}=\frac{16}{3}

You can notice that the numerator and the denominator of the fraction obtained cannot be divided by the same number; therefore, the fraction cannot be simplified.

3 0
3 years ago
Triangle ABC is an isosceles triangle, and side BC is congruent to side AC. If side AC equals 40 centimeters, and AB is one-half
Alik [6]

Answer:

100 cm

Step-by-step explanation:

Given:

AC = BC

AC = 40

2AB=AC

Simplify:

BC = 40

Simplify:

2AB = 40

Algebra:

AB = 20

Here's the sides:

AB = 20

AC = 40

BC = 40

Add all of them together:

100

8 0
3 years ago
John is playing a gamr of darts. The probability that he throws a dart into the center of the dart board (bulls eyes) is 1/10. T
dangina [55]

Answer:

2/5

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
How to solve it with walk through steps
mario62 [17]
You can say

x+y=5
x=5-y

You know the value of x, put it into the next equation.

3(5-y)-7y=19
15-3y-7y=19
15-19 = 10y
-4=10y
-4/10=y
-2/5=y

Put y value back into either equation to find value of x.

x+y=5
x-2/5=5
x=5+2/5
x=27/5

Therefore, x,y = (27/5, -2/5)

Hope I helped :)
6 0
3 years ago
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