3 years ago

Before 1995, three-digit area codes for the united states had the following restrictions:

Mathematics

1 answer:

Rzqust [24]3 years ago

8 0

<span>8C1*2C1*9C1
and the answer is 160</span>

You might be interested in

In a dass of 32 students there are 11 males. Find the ratio of males to females

Levart [38]

$\huge{\boxed{11:21}}$

First, find the number of females in the class. $32-11=21$

Then, just write the ratio. $\text{11 males:21 females}=\boxed{11:21}$

3 0

3 years ago

Plot the points in the coordinate plane. Then find the perimeter and area of the polygon.

anyanavicka [17]

Answer:

The answer to your question is below

Step-by-step explanation:

See the graph below

Process

1.- Find the distance from A to B, B to C, C to D, A to D

Formula

d = $\sqrt{(x2 - x1)^{2} + (y2 - y1)^{2}}$

d AB = $\sqrt{(1 + 3)^{2} + (6 - 5)^{2}} = \sqrt{17}$

dBC = $\sqrt{(-2 -6)^{2} + (3 - 1)^{2}} = \sqrt{68}$

dCD = $\sqrt{(-1 - 3)^{2} + (-3 +2)^{2}} = \sqrt{17}$

dAD = $\sqrt{(-1 + 3)^{2} + (-3 - 5)^{2}} = \sqrt{68}$

2.- Find the perimeter

Perimeter = 2 $\sqrt{17} + 2\sqrt{68}$ = $6\sqrt{17}$ u

3.- Find the area

Area = $\sqrt{17} x \sqrt{68}$

Area = $\sqrt{17x68} = \sqrt{1156} = 34 u^{2}$

7 0

3 years ago

Use double angle formulas to find the exact value of sin2x,cos2x, and tan2x

denis-greek [22]

Sin2x = 2sinxcosx;
cos2x = (cosx)^2 - (sinx)^2;
tan2x = (sin2x)/(cos2x);

cosx = 5/13 from formula (sinx)^2 + (cosx)^2 = 1;

=> sin2x = 120/169;
.................................

5 0

3 years ago

What is 187 divided by 9

Marat540 [252]

187/9= 20.7
20 remainder 7

7 0

3 years ago

Read 2 more answers

PLEASE HELP, WILL MARK BRAINLIEST

m_a_m_a [10]

Answer:

answer is no solution (filler)

8 0

3 years ago