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nirvana33 [79]
3 years ago
8

You earn a score of 86.8 on a standardized exam. Your score is 140% higher than your friend's score on the standardized exam. Wh

at is your friend's score?
Mathematics
1 answer:
Kobotan [32]3 years ago
8 0

Answer:

Your friend scored 62

Step-by-step explanation:

Let your friend's score = x

140/100 * x = 86.8      Starting statement

1.4x = 86.8                  % has been changed to a decimal

1.4x = 86.8/1.4             Divide by 1.4

x = 86.8/1.4

x = 62                          Answer

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What is the subsitution for 2x=12 &x-5y=-29
weeeeeb [17]
Answer: (6, 7)         x = 6
                                y = 7

Isolate x in the first equation.
2x = 12                   Divide by 2 to both sides
x = 6                       Isolated x!

Substitute in (6) for x in the second equation.
(6) - 5y = -29         Remove parenthesises
6 - 5y = -29           Subtract 6 from both sides
-5y = -35               Divide by -5 to both sides      
y = 7                      Isolated y!

With x = 6 and y = 7:
(6, 7)


4 0
3 years ago
Felicia invested money at an interest rate of 4%. After six months, she had earned $90.00 interest. How much money did Felicia i
Sladkaya [172]
The formula is
I=prt
I interest earned 90
P amount invested?
R interest rate 0.04
T time 6/12
Solve the formula for p
P=I÷rt
P=90÷(0.04×(6÷12))
P=4,500 ....answer
5 0
4 years ago
Read 2 more answers
I’ve got this and one more!!!
lisabon 2012 [21]

Area:500{  m}^{2}

5 0
3 years ago
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This is legit due today and I’m nervous that I won’t get done in time. Please help. God bless you.
zlopas [31]

6.

Josef receives 3$ per hour spent doing chores. So, after x hours of chores, he receives 3x dollars. This money must be added to the 10$ he would receive no matter what, so the total expression is

m = 10+3x

7.

We can test the options against the given patterns: in pattern 1, we have one black hexagon and 6 white hexagons. Let's see which equations fit: if we substitute b=1 and w=6 we have:

A) 6 = 6\cdot 1 - ok

B) 6 = 3\cdot 1 +2 - wrong

C) 6 = 2\cdot 1 +4 - ok

D) 6 = 6\cdot 1 + 2 - wrong

E) 6 = 2\cdot 1 + 3 - wrong

So, the only feasible answers are A or C, because all the other functions don't fit even the first pattern. Let's test the two survivors for pattern 2: we have two black hexagons and 8 white hexagons. Plugging b=2 and w=8 into A and C we have

A) 8 = 6\cdot 2 - wrong

C) 8 = 2\cdot 2 +4 - ok

So, the answer is C, because it models correctly pattern 2 as well. For the sake of completeness, let's test this function against pattern 3 as well: we have 3 black and 10 white hexagons. Plugging b=3 and w=10 into C we have

C) 10 = 2\cdot 3 +4 - ok

So, C models correctly all patterns, and thus describe the general rule.

4 0
4 years ago
Rewrite f(x) = -(x + 3)2 - 1 from vertex form to standard form. (2 points)
Mandarinka [93]

Answer:

f(x) = -x^2 - 6x - 10

Step-by-step explanation:

Please write the original equation as  f(x) = -(x + 3)2 - 1, as "(x + 3)2 is meaningless.  We want:

f(x) = -(x + 3)^2 - 1, where " ^ " denotes exponentiation.

Expanding this, we get:

f(x) = -(x^2 + 6x + 9) - 1, or

f(x) = -x^2 - 6x - 9 - 1, or:

f(x) = -x^2 - 6x - 10          This matches the first answer choice.

6 0
3 years ago
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