1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sweet [91]
3 years ago
14

Russells previous test scores are 70,74,87,85 what score does he need to get an average of 80

Mathematics
2 answers:
s344n2d4d5 [400]3 years ago
8 0
70+74+87+85 = 316
For the 5th test score, an 80 average needs 400 as the total score.  So 400-316 = 84 on the next test.
Ludmilka [50]3 years ago
3 0

Answer:

84 is the score that you Russell needs on the next test to achieve an average of at least 80.

Step-by-step explanation:

Russell's test scores are:  70,74,87 and 85

Average of the test scores = A = 80

Let thescore needed to achieve an average of 80 be x

Average = \frac{\text{Sum of terms}}{\text{Number of terms}}

A=\frac{70+74+87+85+x}{5}

80=\frac{70+74+87+85+x}{5}

70+74+87+85+x=400

x=400-(70+74+87+85)=84

84 is the score that you Russell needs on the next test to achieve an average of at least 80.

You might be interested in
Which system is equivalent to<br> y= 9x^2<br> x+y=5<br> ?
melomori [17]

Answer : Option A

Explanation:

we can clearly see that from x+ y=5 we can substitute  y = 5-x in y = 9x^2

Option B is clearly incorrect  x can not be y -5

Option C  is incorrect because y can not be 5 +x

Option D is incorrect because  its y = 9x^2 not y^2 =9x^2 so y can not be 3x

if its y^2 = 9x^2 then  only  implies y =  3x

7 0
3 years ago
Read 2 more answers
What is the nearest hundredth of 2.6666
Advocard [28]

2.66

i need to write 20 characters so im typing this

5 0
3 years ago
This is a 10 point question i need help
Bess [88]
It’s B because they both equal each other I would explain more but I’m in class but the answer is definitely B
4 0
3 years ago
Create an exponential function that starts at 650 and increases by 12% us the form f(x) = p (1=r)^x
ololo11 [35]
F(x)= 650(1+.12)^x

f(x) = 650(1.12)^x
4 0
3 years ago
Please I really need help
ohaa [14]

9514 1404 393

Answer:

  • scale factor: 3
  • rule: (x, y) ⇒ (3x +15, 3y -24)
  • center: (-7.5, 12)

Step-by-step explanation:

The scale factor can be found by comparing the length of CB to the length of RQ.

  B-C = (-2, 8) -(-4, 9) = (2, -1)

  Q-R = (9, 0) -(3, 3) = (6, -3)

The length of RQ is clearly 3 times the length of CB, so the scale factor (k) is ...

  ratio of corresponding differences = 6/2 = -3/-1 = 3 . . . . . scale factor

__

We know that for dilation about a point O, the distance from O is multiplied by the scale factor. For dilation of point B to point Q, this means ...

  k(B -O) = (Q -O)

Solving for Q, we get ...

  Q = kB -kO +O . . . . this is what our dilation rule will look like.

The quantity O-kO can be found by subtracting kB:

  Q -kB = O -kO = O(1 -k)

This is what we need for our dilation rule.

  Q -kB = (9, 0) -3(-2, 8) = (9+6, 0-24) = (15, -24)

So, our dilation rule is ...

  (x, y) ⇒ k(x, y) +(15, -24)

  (x, y) ⇒ (3x +15, 3y -24) . . . . . dilation rule

__

The center of dilation can be found from ...

  (Q -kB)/(1 -k) = O

  O = (15, -24)/(1 -3) = (-7.5, 12)

The center of dilation is (-7.5, 12).

_____

<em>Additional comments</em>

On the graph, the center of dilation can be found by drawing a line through a point and its image. (Points are always dilated along a line through the center of dilation.) The intersection of two such lines is the center of dilation.

On this graph, the center is just above the top edge of the chart, at point (-7.5, 12). You can see this if you carefully draw lines BQ and AP.

You usually have coordinates for two original points and two image points, so finding the scale factor the way we did is not difficult. If you just have one point on the original and the image, the scale factor is found by finding their distances from the center of dilation. Each image point is k times as far as each original point from that center.

7 0
3 years ago
Other questions:
  • An amateur cyclist relay race takes place in the evening. Each team has 6 riders. The prize for winning is £963. How much will e
    7·1 answer
  • Answer that equals 27.36
    8·1 answer
  • Twenty-four 750 milliliter bottles are shipping out of the warehouse. In total, how many liters were shipped?
    8·1 answer
  • 10 POINTS!!! A truss bridge is shown with two parallel horizontal beams crossed by vertical and slanted beams.
    9·1 answer
  • Find the missing side c in right triangle ΔABC, where a = 5 cm, b = 12 cm, and c is the hypotenuse of the right triangle.
    9·1 answer
  • Which statements are true about the ordered pair (-3,1) in the system of equations {x-4y=6 {3x+y=-8 select each correct answer
    10·2 answers
  • Given m \| nm∥n, find the value of x.
    12·1 answer
  • Find the value of x. Round to the nearest tenth.
    6·1 answer
  • A bag contains 3 white balls, 4 green balls. 2 balls are drawn from the bag without replacement. Use a tree diagram to find the
    7·2 answers
  • Here is more of my thing on inner demons or monsters what ever
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!