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vagabundo [1.1K]
3 years ago
8

EASY 9TH GRADE MATH PLEASE HELP ME!!!!

Mathematics
1 answer:
steposvetlana [31]3 years ago
6 0
%/100 = is / of

7 is what percent of 30
is = 7
of = 30
% = x

now sub into the formula

x/100 = 7/30
cross multiply
(30)(x) = (7)(100)
30x = 700
x = 700/30
x = 23 1/3% or 23.33%
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What is the arc measure of BC ?<br> B В<br> 120°<br> 6
fomenos

Answer:

Step-by-step explanation:

120

8 0
3 years ago
A can in the shape of a cylinder has a diameter of 8 inches and a height of 10 inches. Which measurement is closest to the total
Alex

Answer:

Step-by-step explanation:

To find the total surface area of the cylinder

We get

S.A=2πr^2+2πrh

S.A=2×3.142×4×4+2×3.142×4×10

S. A=100.544inches sq+251.36inches sq

S. A=351.904inches sq

6 0
3 years ago
Calculate the side lengths a and b to two decimal places.
navik [9.2K]

Answer:

D. <em>a</em> = 11.71 and <em>b</em> = 15.56

General Formulas and Concepts:

<u>Pre-Algebra</u>

  • Order of Operations: BPEMDAS
  • Equality Properties

<u>Trigonometry</u>

  • All angles in a triangle add up to 180°

<u>Pre-Calculus</u>

  • Law of Sines: \frac{sin(A)}{a} =\frac{sin(B)}{b} =\frac{sin(C)}{c}

Step-by-step explanation:

<u>Step 1: Define</u>

AC = b

CB = a

AB = 7

m∠A = 45°

m∠B = 110°

m∠C = ?

<u>Step 2: Find missing ∠</u>

  1. Set up equation:                    m∠C + 45° + 110° = 180°
  2. Combine like terms:              m∠C + 115° = 180°
  3. Isolate unknown:                   m∠C = 25°

<u>Step 3: Find measure of </u><em><u>b</u></em>

  1. Substitute:                    \frac{sin(25)}{7} =\frac{sin(110)}{b}
  2. Cross-multiply:             bsin(25)=7sin(110)
  3. Isolate <em>b</em>:                       b=\frac{7sin(110)}{sin(25)}
  4. Evaluate:                       b=15.5645
  5. Round:                          b \approx 15.56

<u>Step 4: Find measure of </u><em><u>a</u></em>

  1. Substitute:                    \frac{sin(25)}{7} =\frac{sin(45)}{a}
  2. Cross-multiply:             asin(25)=7sin(45)
  3. Isolate <em>a</em>:                       a=\frac{7sin(45)}{sin(25)}
  4. Evaluate:                       a=11.7121
  5. Round:                          a \approx 11.71
6 0
3 years ago
At 6 A.M the temperature in Hibbing, Minnesota, was -35° F. If the temperature had risen 29° by 2 P.M and
seropon [69]

Answer:

-12°F

Step-by-step explanation:

2 P.M

-35° F + 29° F= -6° F

The temperature had risen by 29°F meaning it went up by 29.

Adding negative 35 and positive 29 is the same as subtracting 35 from 29.

29 - 35 = -6

6 P.M

-6° F - 18°F  = -12°F

The temperature had fallen by 18°F meaning it went down by 18°F.

p.s don't forget the label °F

6 0
4 years ago
What are the x-intercepts of the graph of the function below? y=x^2+2x-15
ikadub [295]

Answer:

x=3  and x=-5

Step-by-step explanation:

To find the x intercepts set y =0 and solve for x

0 = x^2+2x-15

Factor

What two numbers multiply to -15 and add to 2

5*-3 = -15

5+-3 =2

0 = (x+5) (x-3)

Using the zero product property

x+5=0   x-3 =0

x=-5      x=3

6 0
4 years ago
Read 2 more answers
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