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pychu [463]
3 years ago
12

What is -13 + x = -21 ?

Mathematics
2 answers:
Ilia_Sergeevich [38]3 years ago
7 0

Answer:

x= -8

Step-by-step explanation:

Add 13 to both sides.

-13+x= -21

+13      +13

This gives you, x= -8.

masya89 [10]3 years ago
5 0

Answer:

X=-8

Step-by-step explanation:

rearrange

-13+x-(-21)=0

solve

13-21=-8

X=-8

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3 points lie on an xy plane, with each point representing where a particular person lives. Amy lives at point (2,3); Brian lives
geniusboy [140]
The equidistant point for all three, will be the "centroid" of their triangular locations
thus \bf \textit{Centroid of a Triangle}
\begin{array}{llll}
Amy
\begin{array}{llll}
(2,3)\\
x_1,y_1
\end{array}\quad Brian
\begin{array}{llll}
(0,7)\\
x_2,y_2
\end{array}\quad Claire
\begin{array}{llll}
(-2,3)\\
x_3,y_3
\end{array}\\ \quad \\\\\\
\left(\cfrac{x_1+x_2+x_3}{3}\quad ,\cfrac{y_1+y_2+y_3}{3}\quad \right)
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6 0
3 years ago
A store sold 2.5 times as many footballs as basketballs last year. What is the number of footballs sold for every basketball sol
bixtya [17]

Answer:

Step-by-step explanation:

You aren't able to figure out an exact number of either footballs or basketballs because you don't have enough information for that, but you do have enough to get an expression for one in terms of the other, which I imagine is the point here.  We know that for every 1 basketball sold, we sold 2.5 footballs, so the algebraic expression for that is

1 bball = 2.5 fballs

This gives us the number of bballs in terms of fballs but we want the number of fballs in terms of bballs, so solve that expression for fballs:

1 fball = 1/2.5 bballs

or, in words, for every single football sold, 2/5 of a basketball was sold.  Sounds silly, but I think your teacher is trying to get you to figure out how to express one thing in terms of another so you can use the expressions in solving story problems.

:/

6 0
3 years ago
What is the difference of 5 and 2/5? Show your work.
tatuchka [14]

Answer:

This is the answer, let me know if something isn't clear

3 0
3 years ago
The great Pyramid outside Cairo, Egypt, has a square base measuring 756 feet on a side and a height of 480ft
Vlada [557]

Answer:

V = 3,386,880 cubic yards

V = 91445760 cubic feet

V = (1/3) · b2 · h  so  1/3  x 756^2 x 480 = 91445760 ft^3

Answer = 91445760 ft^3

Step-by-step explanation:

converting feet into yards

let  

1 yard = 3 ft  

1 ft = (1/3) yard  

a = 756 ft = 756*(1/3) yards the length of the side of the square base

h = 480 ft = 480*(1/3) yards the height of the pyramid

 

a.) the volume of the pyramid V = (a^2*h)/3 = (a^2*h)(1/3)

V = (756*(1/3))^2*480*(1/3)*(1/3)

V = 3,386,880 cubic yards

7 0
2 years ago
how do i solve this. show all steps plz. this due very soon. help asap no idea what to do. ➡️MAKE SURE TO SHOW ALL STEPS!!!⬅️
noname [10]
First, subtract 14 from 153.80 to get the ticket prices alone. You would get 139.8

Then, since they’re buying 4 tickets, you divide 139.8 by four to get the individual ticket pricing,
meaning your final answer would be $34.95

153.80=4x+14 ⬅️ y-int form if you need that to solve
3 0
3 years ago
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