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egoroff_w [7]
3 years ago
9

Maddy took a test with 25 questions. She lost 3 points for each of the 3 questions she got wrong, but she got 2 extra credit que

stions correct and earned 4 points for each of them. What is the total number of points she gained or lost overall​
Mathematics
1 answer:
artcher [175]3 years ago
5 0

if Maddy lost 3 points for every problem she got wrong.. she lost 9 points. but she gained 4 extra credit points so she only lost 5 points.

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15. Suppose a car gas tank holds 21 gallons of gas. On a trip it uses 2/3 of a tank of gas on a trip. Then it uses 1/3 of what i
Eduardwww [97]

Answer:

4 2/3 gallons of gas

Step-by-step explanation:

Step 1

Suppose a car gas tank holds 21 gallons of gas.

On a trip it uses 2/3 of a tank of gas on a trip.

= 2/3 × 21 gallons of gas

= 14 gallons of gas

Step 2

Then it uses 1/3 of what is left in the tank.

The number of gallons of gas left =

21 gallons of gas - 14 gallons of gas

= 7 gallons of gas

Hence, this is calculated as:

1/3 × 7 gallons of gas

= 2 1/3 gallons of gas

Step 3

How many gallons of gas are left in the tank?

This is calculated as:

7 gallons of gas - 2 1/3 gallons of gas

= 7/1 - 7/3

Lowest common denominator =

= 21 - 7/3

= 14/3

= 4 2/3 gallons of gas is left

Therefore, 4 2/3 gallons of gas is left.

5 0
3 years ago
Name the sets of numbers to which each number belongs
IceJOKER [234]
I need the numbers or the picture of the question before i answer this please
3 0
3 years ago
PLS I NEED HELP WITH MATH HOMEWORK <br> FIND THE VALUE OF THE VARIBLE
zzz [600]

Answer:

n=46

Step-by-step explanation:

Since this is a right triangle, you are left with 90 degrees

2n-2=90

2n=92

n=46

3 0
3 years ago
Solve 7log9(x + 8) = 7
Bumek [7]
Remember
log_a(b)=c translates to a^c=b

alrighty

so we've got
7log_9(x+8)=7
divide both sides by 7
log_9(x+8)=1
translate
9^1=x+8
9=x+8
minus 8 both sides
1=x
x=1
8 0
3 years ago
Help please :(. :( :(.,,,,,,,,,,,,,,,,
Volgvan

Answer:

  • y-intercept: y=9
  • zeros: x= -3, -1, 1, 3

Step-by-step explanation:

The y-intercept is where the graph crosses the y-axis. On this graph, that is just below y=10. A reasonable estimate* of the y-intercept is y=9.

__

The zeros are those places on the graph where y=0. The line y=0 is the x-axis, so the zeros are the x-values of the places where the graph crosses the x-axis. Those points are clearly labeled: x = -3, -1, 1, 3.

_____

* Knowing the zeros, you can write a factored-form equation for the graph:

  y = (x +3)(x +1)(x -1)(x -3)

You can substitute x=0 in this equation to see what the y-intercept would be:

  3×1×-1×-3 = 9

That is, with no scale factor applied to the function, its y-intercept would be 9. This is the same value we estimated above, so it is reasonable to assume that value is correct.

8 0
4 years ago
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