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k0ka [10]
4 years ago
11

What is the sum 3-1 5-9

Mathematics
2 answers:
stepan [7]4 years ago
7 0
Step by Step through PEMDAS: 

1) 3-15-9
2) -12 - 9
3) -21  

...Hope it helps...
schepotkina [342]4 years ago
4 0
3-1= 2
5-9= -4 or 4 depending if you meant 9-5 and if so then it would be 4
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Jenelle has a piece of wire that is 0.30 feet long. She needs 2.5 times that length to hang a painting. What length of wire does
suter [353]

Answer:

She needs 0,75 ft of wire

Step-by-step explanation:

Hello

She needs (0.30 ft)*(2.5) = 0,75

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6 0
3 years ago
Suppose that Professor Rodgers needs one small group of students from his class to participate in a focus group. There are 11 st
irinina [24]

Answer:

(A) 165

(B) 330

Step-by-step explanation:

Total number of students in the class = 11

(A) How many different combinations of 3 selected students can he create?

ⁿCₓ = n! ÷ [(n - x)! x!]

n = 11,  x = 3

11! / [8! 3!]  = 165

<em>HINT:  8! or 8 factorial represents [8x7x6x5x4x3x2x1]</em>

(B) How many different combinations of 4 selected students can he create?

ⁿCₓ = n! ÷ [(n - x)! x!]

n = 11,  x = 4

11! / [7! 4!]  = 330

<em>Same hint applies here, for all numbers with the factorial sign.</em>

4 0
3 years ago
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masya89 [10]

Answer:

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Step-by-step explanation:

3 0
3 years ago
Given that y= 2* (power of X)
svetoff [14.1K]
A)
y=2^x

4^x=2^(2x)=y²

solution:
y=2^x hence y²=4^x

chek:
x=5 ⇒ y=2⁵=32
4⁵=1024
y₂=32²=1024

b)
 8(4^x)-9(2^x)+1=0
8(2^(2x)-9(2^x)+1=0

2^x=t

8t²-9t+1=0
We solve the quadratic.
t₁=1/8    ⇒2^x=1/8
2^x=1/2³
2^x=2⁻³
x=-3

t₂=1  ⇒ 2^x=1  ⇒x=0

Solutions:
x=-3
x=0

5 0
3 years ago
Fourteen out of 20 teens said they eat breakfast every morning what is a reasonable prediction for the number of teens out of 12
Oksi-84 [34.3K]

Answer:

896

Step-by-step explanation:

14 of 20 teens eats breakfast every morning.

The percentage of those who eat breakfast every morning

= 14/20 x 100%

= 0.7 x 100%

= 70%

So, 70% of 20 teens eat breakfast every morning.

The reasonable prediction for the number of teens that eats breakfast every morning from 1280 teens will be 70% of 1280.

70/100 x 1280

0.7 x 1280

896

The prediction would be 896 out of 1280 teens eats breakfast every morning

8 0
4 years ago
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