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diamong [38]
3 years ago
15

Jenny scored 80% on her math test if there were 40 questions how many did he get correct

Mathematics
2 answers:
disa [49]3 years ago
8 0
It's pretty easy to know what Jenny has got correct
Scored= 80%
Questions= 40

80% × 40

80/100 (40)

 80      40
-----    -----
100      1

(4/5) (40/1)


(4) (40)
----------
 (5) (1)

160
-----
  5

= 32

Jenny got 32 questions correct
Hope this helps!
Alexxx [7]3 years ago
3 0
80% mean 80/100=8/10=4/5

4/5 of 40=4/5 times 40/1=160/5=32

answer is 32 quetsions

easier way
10% times 8=80%
10% of 40=4
4 times 8=32



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ordered pair: (1 ,15)

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30 ÷ 2 = 15

45 ÷ 3 = 15  

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they both have 15, which means the graph is proportional and the unit rate is $15 per hour

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6 0
3 years ago
Someone help me please. I don't just want the answer, I need an explanation on how it's done too.​
NARA [144]

Answer:

Below.

Step-by-step explanation:

f) (a + b)^3 - 4(a + b)^2  

The (a+ b)^2 can be taken out to give:

= (a + b)^2(a + b - 4)

= (a + b)(a + b)(a + b - 4).

g)  3x(x - y) - 6(-x + y)

=  3x( x - y) + 6(x - y)

= (3x + 6)(x - y)

= 3(x + 2)(x - y).

h) (6a - 5b)(c - d) + (3a + 4b)(d - c)

=  (6a - 5b)(c - d) + (-3a - 4b)(c - d)

= -(c - d)(6a - 5b)(3a + 4b).

i)  -3d(-9a - 2b) + 2c (9a + 2b)

= 3d(9a + 2b) + 2c (9a + 2b)

=  3d(9a + 2b) + 2c (9a + 2b).

= (3d + 2c)(9a + 2b).

j)  a^2b^3(2a + 1) - 6ab^2(-1 - 2a)

=  a^2b^3(2a + 1) + 6ab^2(2a + 1)

= (2a + 1)( a^2b^3 + 6ab^2)

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(2a + 1)ab^2(ab + 6)

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4 0
3 years ago
The cost of 3 notebooks and 2 pencils is $5.10. At the same prices, the cost of 2 notebooks and 3 pencils is $4.65. What is the
Pepsi [2]

Answer:

$1.95

Step-by-step explanation:

notebook = n

pencil = p

3n + 2p = 5.10

2n + 3p = 4.65

multiply top equation by 2 and bottom by 3

6n + 4p = 10.20

6n +9p = 13.95

subtract bottom equation from the top equation

-5p = -3.75

divide by 5, negatives cancel out

p  = 0.75

sub p into either equation, I chose the original top equation

3n + 2(0.75) = 5.10

3n + 1.50 = 5.10

subtract 1.50 from both sides

3n = 3.60

divide both sides by 3

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4 0
3 years ago
-0.312 as a fraction in simplest form
Black_prince [1.1K]

Answer:

It's -39/125

Step-by-step explanation:

Rewrite the decimal number as a fraction with 1 in the denominator

Multiply to remove 3 decimal places. Here, you multiply top and bottom by 103 = 1000

Find the Greatest Common Factor (GCF) of 312 and 1000, if it exists, and reduce the fraction by dividing both numerator and denominator by GCF = 8

Therefore

X=39/125

In conclusion,

−0.312=−39/125

4 0
3 years ago
Read 2 more answers
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