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timama [110]
3 years ago
7

On the last three chemistryexams a student scored 87, 88​, and 89. What score must the student earn on the next exam to have an

average of at least​ 90?
The student must score at least ___%.
Mathematics
1 answer:
hammer [34]3 years ago
4 0

Answer:96%

Step-by-step explanation: 4 x 90 = 360, 87 + 88 + 89 = 264, 360 - 264 = 96

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A boat crew rowed 10.5 miles downstream, with the current, in 1.5 hours. the return trip upstream , against the current , covere
alukav5142 [94]

Answer:

The speed of the boat is 5 miles per hours

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Step-by-step explanation:

Given as :

The distance cover by boat downstream = D = 10.5 miles

The time taken by boat to cover D distance = T = 1.5 hours

The distance cover by boat Upstream = d = 10.5 miles

The time taken by boat to cover d distance = t = 3.5 hours

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Let The speed of current =  mph

Now, According to question

∵ Speed = \dfrac{Distance}{Time}

<u>For Downstream</u>

x + y = \dfrac{D}{T}

Or, x + y =  \dfrac{10.5}{1.5}

Or, x + y = 7          .......A

<u>For Upstream</u>

x - y = \dfrac{d}{t}

Or, x - y =  \dfrac{10.5}{3.5}

Or, x - y = 3          .......B

Now, Solving eq A and eq B

So, (x + y) + (x - y) = 7 + 3

Or, (x + x) + (y - y) = 10

Or, 2 x + 0 = 10

∴  x = \dfrac{10}{2}

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So, The speed of the boat = x = 5 miles per hours

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Or, 5 + y = 7

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i.e y = 2 mph

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Hence, The speed of the boat is 5 miles per hours and The speed of the current is 2 miles per hours . Answer

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Given the function f(x) = 3x + 1, what is the value of f(-2/3)? <br><br>show work <br>​
Marta_Voda [28]

Answer:

f(-2/3) = -1

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

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  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
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<u>Algebra I</u>

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Step-by-step explanation:

<u>Step 1: Define</u>

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<u>Step 2: Evaluate</u>

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