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Leona [35]
3 years ago
14

Mark got 14 problems wrong on his test. His score was 72% correct. How many problems were on the test? Please show work.

Mathematics
1 answer:
stira [4]3 years ago
7 0
Consider that 100%-72%=28% represents the percentage of wrong answers. I would think as fractions as:
if 100%  is the total number of answers and 28% are the wrong ones
as
if x is the total you have 14 wrong you can write:
\frac{100}{28} = \frac{x}{14}
x=(100/28)*14=50 questions
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Answer:

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Step-by-step explanation:

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3 years ago
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What is 4.5w=5.1w-30 step by step please
vampirchik [111]


4.5w = 5.1w -30

4.5w - 5.1w = 5.1w - 5.1w -30 (subtracted 5.1w on both sides)

4.5w - 5.1w = -30 (next combine like terms)

-0.6w = -30 (next do the inverse operation of w)

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so your final answer is: w = 50

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8 0
3 years ago
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Nico was stunned when he opened the mail.Here was a check for $332.50 this is the interest he earned on his investment.One year
Mazyrski [523]

Answer:

Investment A = 3650

Investment B = 1350

Step-by-step explanation:

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7 0
2 years ago
Let f(x)=x^2+2x+3 . What is the average rate of change for the quadratic function from x=−2 to x = 5?
miskamm [114]
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f(b) - f(a)
------------
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Here your function is f(x) = x^2 - 2x + 3.  Substituting b=5 and a=-2,
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Calculate           f(5) - [ f(-2) ]
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Your answer to this, if done correctly, is the "average rate of change of the function f(x) = x^2+2x+3 on the interval [-2,5]."
5 0
3 years ago
Which sequence matches the recursive formula?
goldenfox [79]
Hello:
<span>an = 2an-1 + 5, where a1 = 5
n =2   a2 = 2a1 +5 = 2(5)+5 = 15
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answer : 
<span>B) 
5, 15, 35, 75, ...</span>
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3 years ago
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