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Flura [38]
3 years ago
15

What must the value of x be, so that a parallel to b, m∠2 = 70°, and m∠7=(3x + 10)°?

Mathematics
1 answer:
Ksju [112]3 years ago
5 0
70=3x+10
Subtract 10 from both sides
60=3x
Divide both sides by 3
20=x
x=20
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G
kvv77 [185]

Answer:

Girls in Mr. Chang's class: 28 - 21 ; # girl students = # total students - # boy students ; 7 girl students.

Boys in Mr. Chang's class: 28 - 7 ; # boy students = # total students - girl students ; 21 boy students.

8 0
3 years ago
The mass of a species of mouse commonly found in houses is normally distributed with a mean of 20.2 grams with a standard deviat
Sophie [7]

Answer:

12.1%

Step-by-step explanation:

Given that:

Mean (μ) = 20.2 grams and standard deviation (σ) = 0.18 grams.

The z score is a score used to determine the number of standard deviations by which the raw score is above or below the mean. A positive z score means  that the raw score is above the mean and a negative z score means that the raw score is below the mean. It is given by:

z=\frac{x-\mu}{\sigma}

a) For x < 19.99 g:

z=\frac{x-\mu}{\sigma}\\\\z=\frac{19.99-20.2}{0.18} \\\\z=-1.17

From the normal distribution table, P(x < 19.99) = P(z < -1.17) = 0.1210 = 12.1%

The probability that a randomly chosen mouse has a mass of less than 19.99 grams is 12.1%

6 0
3 years ago
Evaluate 10 + 8÷4 - 12
Kryger [21]

Answer:

0

Step-by-step explanation:

evaluate 10 + (8÷4) - 12

3 0
2 years ago
Read 2 more answers
Solve for x. 26x2–9x=0
Lilit [14]

Answer:

x=0;x=\frac{9}{26}

Step-by-step explanation:

assuming you meant 26x^2-9x=0:

26x^{2} -9x=0\\x(26x-9)=0\\x=0;x=\frac{9}{26}

3 0
3 years ago
Lloyd and Linda Pearl want to remodel the dining room in their house. The estimated cost for the job is $6,890. They pay 30 perc
mylen [45]
A. 2067.
6890 time .30 (30 percent) is 2067
B. 4823
inital ammount minus down payment
6890 - 2067 = 4823
C 134.08
Total ammount multiplied by percentage (0.0278)
4823 * .0278 = 134.079  per month
D.1612.81
find total paid and subtract initial ammount to find finance charge
(134.08*48)= 6435.81
6435.81-4824 = 1612.81
3 0
3 years ago
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