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Gre4nikov [31]
3 years ago
12

What is x in 2(x+20)=90

Mathematics
2 answers:
katovenus [111]3 years ago
6 0

Answer:

25

Step-by-step explanation:

2(25+20)=90. 25 plus 20 is 45 and 45 times 2 is 90

diamong [38]3 years ago
5 0
X is the variable in this equation
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Peggy had four times as many quarters as nickels. She had $2.10 in all. How many nickels and how many quarters did she have?
kari74 [83]
For the answer to the question above, 
and we are told that there are "four times as many quarters as nickels"
this translates to
q = 4n

0.05n + 0.25q = 2.10
and
q = 4n
are your two equations that could be used to solve this problem


if you would like to know how many nickels and how many quarters there are, plug in q = 4n into the first equation and get
0.05n + 0.25(4n) = 2.10
then I would stop here
because I didn't see the choices. So the answer is 4n
8 0
3 years ago
HEPL!! due in 2 hours so please help or attempt! I came up with 5 different answers and don't know which one is the actual answe
Molodets [167]

Answer:

Original Price = $23

Step-by-step explanation:

$5.75 is the price after a discount of 75%

Let the original price be x and x is 100% of the price

5.75 = 100%x - 75%x

5.75 = 25%x

The new price is 25% of the original because you are subtracting 75%

25% is also written as 0.25

5.75 = 0.25x

x = 5.75/0.25

x = 23

The original price is 23

-Chetan K

3 0
2 years ago
2x^2-9x+5 solve from quadratic formula
Black_prince [1.1K]
Answer is either x= 1/2 x=-5
7 0
2 years ago
Read 2 more answers
How to graph a line passing through (3,-2) that’s perpendicular to the graph of x=-3 and writing a equation of it
VikaD [51]

check the picture below.

8 0
3 years ago
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ryzh [129]

Answer:

see below

Step-by-step explanation:

f(x)= -0.08x(x^2-11x+18)

Factor

f(x)= -0.08x(x-9)(x-2)

Using the zero product property to find the zeros

0= -0.08x(x-2)(x-9)

-0.8x =0    x-2 =0  x-9 =0

x=0            x=2           x=9

Multiply out

f(x) =  -0.08 x^3 + 0.88 x^2 - 1.44 x

The highest power is x^3

f(-∞) = -0.08( -∞)^3 = - ( -∞) = ∞

As x goes to -∞  f(x) goes to +∞

f(∞) = -0.08( ∞)^3 = - ( ∞) = -∞

As x goes to ∞  f(x) goes to -∞

5 0
3 years ago
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