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MArishka [77]
2 years ago
4

Chris and Bianca got 80 points in all in the spelling contest. Each child got more than 20 points. How many could each child hav

e gotten?
Mathematics
2 answers:
Mazyrski [523]2 years ago
7 0
You would set up an inequality which is greater than (x>20) for each student then solve for x.
trasher [3.6K]2 years ago
6 0
Chris and Bianca both got 20 points<span />
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What property was used on 14k+2(3k+5)-5=10 to obtain 14k+6k+10-5=10
ohaa [14]
The difference between

i) <span>14k+2(3k+5)-5=10  and

ii)  </span><span>14k+6k+10-5=10

is the equality </span>2(3k+5)=6k+10


The property used here, can be described for any numbers a, b and c as:

a \cdot (b+c)=a \cdot b +a \cdot c


This is called the DISTRIBUTIVE PROPERTY 


Answer: DISTRIBUTIVE PROPERTY 
3 0
2 years ago
A plant can either have a smooth seed (p) or a rough seed (q). Rough seeds are recessive and smooth seeds are dominant. In a pop
adell [148]
To calculate this, the Hardy-Weinberg principle can be used:

p² + 2pq + q² = 1 and p + q = 1

where p and q are the frequencies of the alleles (p - dominant, q - recessive), and p², q² and 2pq are the frequencies of the genotypes.

a) Since 32 plants have rough seed (recessive genotype: q²) out of 100 plants in total, then 

q² = 32/100 = 0.32


b) q = √q² = √0.32 = 0.56


c) Since p + q = 1, then

p = 1 - q = 1 - 0.56 = 0.44


d) 19 plants with rough seeds (recessive genotype: q²) in a population of 100 means that q² = 19/100 = 0.19

We need to calculate p (the allele frequency for smooth seeds).
We can find q because we know q²:

q = √q² = √0.19 = 0.44

Since p + q = 1, then

p = 1 - q = 1 - 0.4 = 0.56

3 0
2 years ago
For which function does f decrease by 15% every time x increases by 1
LenaWriter [7]

Answer:

f(x) = 0.85^{x}

Step-by-step explanation:

The exponential function that decrease by 15% every time x increases by 1 is given by:

f(x) =  {(1 - 0.15)}^{x}

We simplify the parenthesis to get:

f(x) = 0.85^{x}

Therefore the decrease by 15% every time x increases by 1 is

f(x) =  {0.85}^{x}

The second choice is correct.

7 0
2 years ago
Make the following conversion. 420 hg = _____ cg 4200000 420000 0.0420 0.00420
Otrada [13]
Using the standards of conversions, we will find that 1 hg is equivalent to 10000 cg.
Therefore, to convert 420 hg to cg, all you have to do is cross multiplication as follows:
420 hg = (420 x 10000) / 1 = 4200000 cg

The correct choice is: 4200000
7 0
2 years ago
Read 2 more answers
Victoria has $200 of her birthday gift money saved at home, and the amount is modeled by the function h(x) = 200. She reads abou
olchik [2.2K]
If Victoria puts 200 dollars a savings account she will earn 1.05 for x amount of time.<span>
</span>
7 0
2 years ago
Read 2 more answers
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