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Fynjy0 [20]
3 years ago
6

To solve a system of equations, you can replace a ____________with an equal value or expression.

Mathematics
1 answer:
Ludmilka [50]3 years ago
4 0

Answer:

Variable

Step-by-step explanation:

If you can substitute a unknown variable with another expression that is equal, you can then solve for another variable, and with that equal expression, solve for the first variable.

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Simplify the expression<br> (3x4 + 9x3 – 7x + 15) + (-6X4 – 8x2 + 5x – 3)
elena-s [515]

Answer:

If the numbers next to the "x" are "carroted" ( ^ ) then the answer is

-3x^4 + 9x^3 -8x^2 -2x +12

Step-by-step explanation:

Basically, you just add the like terms together.

5 0
3 years ago
How do you solve the equation z-2z-3=-7
finlep [7]
Hey, it’s very easy. You just need to do like that:

z-2z-3=-7
z-2z= -7+3
-1z = -4 | : (-1)
z = 4

The answer is 4.
4 0
4 years ago
Ella had softball and dance practice for 4 weeks. She practiced softball 2 hours a week and dance 1 hour a week. Which operation
weqwewe [10]

4 multiplied by 2 by 1 because its her hours for the weeks no other way to calculate this problem

4 0
3 years ago
Read 2 more answers
A spherical exercise ball has a maximum diameter of 30 inches when filled with air. The ball was completely empty at the start,
Alex73 [517]

Answer:

A) A(t)  =  4500*π  -  1600*t

B) A(4)  =  7730 in³

C) t  =  8,8 sec

Step-by-step explanation:

The volume of the sphere is:

d max  =  30   r max  =  15 in

V(s) =  (4/3)*π*r³      V(s)  =   (4/3)*π* (15)³

V(s) = 4500*π

A)  Amount of air needed to fill the ball A(t)

A(t)  = Total max. volume of the sphere - rate of flux of air * time

A(t)  =  4500*π  -  1600*t    in³

B) After 4 minutes

A(4)  =  4500*π  - 6400

A(4)  =  14130 - 6400

A(4)  =  7730 in³

C)  A(t)  =  4500*π  -  1600*t  

when  A(t) = 0   the ball got its maximum volume then:

4500*π -  1600*t  =  0

t  =   14130/1600

t  =  8,8 sec

8 0
3 years ago
The larger of two numbers is seven less than three times the smaller number. If the sum is 61, find the numbers.
swat32

Answer:

17 and 44

Step-by-step explanation:

Let S = smaller number, then L = the larger = 3S - 7

 

The sum = 3S - 7 + S = 4S - 7 = 61

4S = 68

S = 17 and L = 44

6 0
3 years ago
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