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mart [117]
4 years ago
5

The graph below shows the distribution of students grades on their last math test. Based on the Empirical rule, what percent of

students made..
*btwn 80 n 85 on the test?
*btwn 80 n 95 on the test?
* below 85 on the test?
*above an 80 on the test?

Mathematics
1 answer:
timurjin [86]4 years ago
5 0
Based on the emperical rule
the distribution will be as follows

btwn 80 n 85 on the test - 34%
btwn 80 n 95 on the test - 82%
below 85 on the test - 50%
<span>above an 80 on the test - 84%</span>
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Use the discriminant to describe the roots of each equation. Then select the best description. x^2 + 9x + 14 = 0
NISA [10]

B

given a quadratic equation in standard form

ax² + bx + c = 0

Then we can describe the nature of the roots using the discriminant

Δ = b² - 4ac

• if b² - 4ac > 0, then 2 real, distinct and irrational roots

• if b² - 4ac > 0 and a perfect square, then real and rational roots

• if b² - 4ac = 0, then real and equal roots

• if b² - 4ac < 0, then roots are not real

for x² + 9x + 14 = 0

with a = 1, b= 9 and c = 14, then

b² - 4ac = 9² - (4 × 1 × 14 ) = 81 - 56 = 25

Since b² - 4ac > 0 and a perfect square, then roots are real and rational


7 0
3 years ago
If 60% of a number is 18, what is 90%of the number?
TiliK225 [7]
1) B. 16 2) D.14.80 Multiply the percentage by the amount If using a calculator, 90% is 90/100
5 0
4 years ago
denise is putting a fence around her garden.The total perimeter of the garden is 14 feet,with the length measuring 3 feet.What i
alex41 [277]

Answer:

4

Step-by-step explanation:

14 feet is the perimeter

to get the perimeter you need to add alll the sides together

if the length is 3 feet then u add

3 + 3 for both sides

then you subtract 6-14

and that is 8

then you divide it by 2 becuase u need it for one side not both sides combined

4 0
4 years ago
Mrs.Lohens made curtains for her children’s bedrooms. She used 4 3/4 yards of fabric for Nickys room and 6 5/8 yards for Linda’s
Gelneren [198K]

Answer:

11\frac{3}{8}\ yd

Step-by-step explanation:

we know that

To find out the total yards of fabric used, add up the yards of fabric used for Nickys' room and the yards of fabric used for Linda's room

so

4\frac{3}{4}+6\frac{5}{8}

Convert mixed number to an improper fraction

4\frac{3}{4}\ yd=4+\frac{3}{4}=\frac{4*4+3}{4}=\frac{19}{4}\ yd

6\frac{5}{8}\ yd=6+\frac{5}{8}=\frac{6*8+5}{8}=\frac{53}{8}\ yd

Adds the fractions

\frac{19}{4}+\frac{53}{8}=\frac{2*19+53}{8}= \frac{91}{8}\ yd

Convert to mixed number

\frac{91}{8}\ yd= \frac{88}{8}+ \frac{3}{8}= 11\frac{3}{8}\ yd

6 0
3 years ago
Is 9/12 equal to 5/8?
Novay_Z [31]
No, 9/12 is equivalent to 3/4.
Hope this helps.
6 0
3 years ago
Read 2 more answers
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