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anzhelika [568]
3 years ago
14

7 + 4 + -8 + -7 + -5 + 2=? Is the answer -7?

Mathematics
2 answers:
balandron [24]3 years ago
4 0

Answer:

Yes

Step-by-step explanation:

Alisiya [41]3 years ago
3 0

Yes, the answer is -7.

7 + 4 + -8 + -7 + -5 + 2 =

= 7 - 7 + 4 + -8 + -5 + 2 =

= 4 + -8 + -5 + 2 =

= -4 + -5 + 2 =

= -9 + 2 =

= -7

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Please help math experts need your help 15 points !
Alinara [238K]

Answer:

12 = -3 - 3x

Step-by-step explanation:

Same concept as the last question I answered. First, let's derive a formula from the given model. So we have 3 negative x and 3 negative 1 which equal to 12 positive ones, this can be written as:

-3x - 3 = 12

which can be rewritten as

12 = -3 - 3x

7 0
3 years ago
PLZ HELP ASAP SOLID GEOMETRY WORD PROBLEMS
yan [13]
The volume of the candle initially is:
V=Ab*h
Area of the base of the cylinder: Ab=pi*r^2
pi=3.14
Radius of the base: r=4 cm
Height of the cylinder: h=6 cm

Ab=pi*r^2
Ab=3.14*(4 cm)^2
Ab=3.14*(16 cm^2)
Ab=50.24 cm^2

V=Ab*h
V=(50.24 cm^2)*(6 cm)
V=301.44 cm^3

The candle melts at a constant rate of:
r=(60 cm^3)/(2 hours)=(120 cm^3)/(4 hours)=(180 cm^3)/(6 hours)
r=30 cm^3/hour

The amount of candle melted off after 7 hours is:
A=(30 cm^3/hour)*(7 hours)
A=210 cm^3

The percent of candle that is melted off after 7 hours is:
P=(A/V)*100%
P=[(210 cm^3)/(301.44 cm^3)]*100%
P=(0.696656051)*100%
P=69.66560510%
Rounded to the nearest percent
P=70%

Answer: 70%

8 0
3 years ago
Factor 9(x + 4)^2 + (x + 4) – 10 completely.<br> HELP!!!
AleksAgata [21]

Answer:

99

Step-by-step explanation:

7 0
3 years ago
Determine the approximate value of θ. <br> A. 38.9<br> B. 51.1<br> C. 37.9<br> D. 52.1
Pepsi [2]

Answer:

Option B. 51.1^o

Step-by-step explanation:

we know that

In the right triangle of the figure

The sine of angle theta is equal to divide the opposite side to angle theta by the hypotenuse

so

sin(\theta)=\frac{DF}{DE}

substitute the given values

sin(\theta)=\frac{7}{9}

using a calculator

\theta=sin^{-1}(\frac{7}{9})=51.1^o

8 0
3 years ago
What is the prefix in regroup? what dose it mean?
kupik [55]
The prefix in the word "regroup" is "re" and it means "again". Separate the words like this (re)read to find the "prefix" 

Just think when your teacher ask you to reread the book or the problem.It should come to mind as "Read again" 

Good Luck! 
3 0
3 years ago
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