5x-2y=3 -5x+4y=9 Solve the system of equations

(3.14×10^7)×(1.3×10^−3)÷0.2 Please answer in scientific notation. Thank you.

frez [133]

When you evaluate the problem you end up with 204100
Scientific Notation: 2.041 x 10^5

8 0

3 years ago

Chords and arcs. Can someone please help me with this and explain???20 points

anyanavicka [17]

Answer:

89

Step-by-step explanation:

So the line segment CD is 12.7 and half that is 6.35. I wanted this 6.35 so I can look at the right triangle there and find the angle there near the center. This will only be half the answer. So I will need to double that to find the measure of arc CD.

Anyways looking at angle near center in the right triangle we have the opposite measurement, 6.35, given and the hypotenuse measurement, 9.06, given. So we will use sine.

sin(u)=6.35/9.06

u=arcsin(6.35/9.06)

u=44.5 degrees

u represented the angle inside that right triangle near the center.

So to get angle COD we have to double that which is 89 degrees.

So the arc measure of CD is 89.

5 0

3 years ago

Help? a) 2/10 + 8/100 b) 13/100 + 4/10 c) 6/10 + 39/100 D) 70/100 + 3/10

Leni [432]

$\green{––––––––––––––––––––––––––––––}$

$\huge\red{\boxed{\tt{{«ANSWER»}}}}$

A) 2/10 + 8/100 = 0.28
B) 13/100 + 4/10 = 0.53
C) 6/10 + 39/100 = 0.99
D) 70/100 + 3/10 = 1

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#carry on learning <3

5 0

2 years ago

6 people consists of 3 married couples. Each couple wants to sit with older partner on the left.

Lera25 [3.4K]

a. The first part asks for how many ways they can be seated together in a row. Therefore we want the permutations of the set of 6 people, or 6 factorial,

6! = 6 $*$ 5

= 30 $*$ 4

= 360 $*$ 2 = 720 possible ways to order 6 people in a row

b. There are two cases to consider here. If the doctor were to sit in the left - most seat, or the right - most seat. In either case there would be 5 people remaining, and hence 5! possible ways to arrange themselves.

5! = 5 $*$ 4

= 20 $*$ 3

= 120 $*$ 1 = 120 possible ways to arrange themselves if the doctor were to sit in either the left - most or right - most seat.

In either case there are 120 ways, so 120 + 120 = Total of 240 arrangements among the 6 people if the doctor sits in the aisle seat ( leftmost or rightmost seat )

c. With each husband on the left, there are 3 people left, all women, that we have to consider here.

3! = 3 $*$ 2 6 ways to arrange 3 couples in a row, the husband always to the left

8 0

3 years ago

M_6 is (2x - 5)º and m_8 is (x + 5)º. What is m 3?

oksano4ka [1.4K]

m_3 is (7x-4)°

Step-by-step explanation:

which is that m_3 is(7x -4)°.

3 0

3 years ago