What is 7x= -3 please help me answer this

Mathematics

2 answers:

Veseljchak [2.6K]3 years ago

7 0

Answer:

First of all, it's definitely going to be a negative number.

The answer is -2.333 repeating.

Step-by-step explanation:

Divide the negative 3 (-3 by 7)

jeka943 years ago

3 0

Answer:

x=-3/7

......

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The sum of the ages of Jeremy and Kimberly is 64 years. 8 years ago, Jeremy's age was 2 times Kimberly's age. How old is Jeremy

TiliK225 [7]

Answer:

36.666 (The six keeps going)

Step-by-step explanation:

In this question you'll be trying to find out what x is.

(x-8), this is from the amount of years ago and 2(56-x) is from subtracting 8 with 64 and the 2 came from the fact that Jeremy is twice the age.

(x-8)=2(56-x)

x-8=102-2x

Now we want to have x by itself so we'll add 2x on both sides to remove the -2x from the right side.

3x-8=102 (Add up on both sides)

3x=110 (Divide by 3)

x=36.666

4 0

3 years ago

Number 1 has a picture

MA_775_DIABLO [31]

Question 1

cos(C) = adj/hyp
cos(C) = BC/AC
cos(C) = 15/17

Answer: Choice C) 15/17

=============================================

Question 2

sin(E) = opp/hyp
sin(E) = FD/DE
sin(E) = 24/25

So angle E is the answer

=============================================

Question 3

AC is the adjacent side to the given angle A = 33 degrees
AB = 14 is the hypotenuse

cos(angle) = adjacent/hypotenuse
cos(33) = x/14
14*cos(33) = x
x = 14*cos(33)
x = 11.741
x = 11.7

Answer: 11.7

=============================================

Question 4

x = length of board

cos(angle) = adj/hyp
cos(55) = 6/x
x*cos(55) = 6
x = 6/cos(55)
x = 10.46068
x = 10.5

Answer: 10.5

=============================================

Question 5

112 is the adjacent side to the given angle 62 degrees
x = height of building, which is the opposite leg

tan(angle) = opp/adj
tan(62) = x/112
112*tan(62) = x
x = 112*tan(62)
x = 210.641364
x = 210.6

Answer: 210.6

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4 years ago

'Polonium-210 is a radioactive substance with a half-life of 138 days. If a nuclear

Tatiana [17]

Answer:

<u>59.0891 g (rounded to 4 decimal places)</u>

Explanation:

<em>Half-life time</em> of a radioactive substance is the time for half of the substance to decay.

Thus, the amount of the radioactive substance that remains after a number n of half-lives is given by:

$A=A_0\cdot (1/2)^n$

Where:

A is the amount that remains of the substance after n half-lives have elapses, and

A₀ is the starting amount of the substance.

In this problem, you have that the half-live for your sample (polonium-210) is 138 days and the number of days elapsed is 330 days. Thus, the number of half-lives elapsed is: