Help plz and thx for your help

Mathematics

1 answer:

Bumek [7]3 years ago

3 0

9514 1404 393

Answer:

Dawn has $1670 in account 1 and $1570 in account 2.

Step-by-step explanation:

Dawn can multiply the second equation by 8 and add 7 times the first equation.

8(3/8A +7/8B) +7(A -B) = 8(2000) +7(100)

10A = 16,700

A = 1670

B = 1570 . . . . 100 less than A

Dawn has $1670 in account 1 and $1570 in account 2.

Check

3/8(1670) +7/8(1570) = 626.25 +1373.75 = 2000

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The ratio of boys to girls in a class is 2:5, what fraction of the class are boys?

Andre45 [30]

Step-by-step explanation:

$= \frac{2}{2 + 5} \\ = \frac{2}{7}$

HOPE THIS HELPS!

7 0

1 year ago

Which measure is of an angle that is coterminal with a 425 degree angle

Karo-lina-s [1.5K]

We know that co terminal angles are those angles which have a difference equal to a multiple of 360 degrees. For example co terminal angle of 45 degrees is 76 degrees because their difference is equal to 720 degrees, which is a multiple of 360.

We have been given an angle 425 degrees.

From the given choices, we need to check if angles being added or subtracted to 425 degrees are multiples of 360 or not.

Let us check each of the options one by one.

(A) The angle being subtracted is $1000n$ . Therefore, we have $\frac{1000n}{360}=2.77n$ , which is not an integer for all values of n. Therefore, angle given in this option is not a co terminate angle to 425 degrees.

(B)

The angle being subtracted is $840n$ . Therefore, we have $\frac{840n}{360}=2.33n$ , which is not an integer for all values of n. Therefore, angle given in this option is not a co terminate angle to 425 degrees.

(C)

The angle being added is $960n$ . Therefore, we have $\frac{960n}{360}=2.67n$ , which is not an integer for all values of n. Therefore, angle given in this option is not a co terminate angle to 425 degrees.

(D)

The angle being added is $1440n$ . Therefore, we have $\frac{1440n}{360}=4n$ , which is an integer for all values of n. Therefore, angle given in this option is indeed a co terminate angle to 425 degrees.