3 years ago

10 points

Mathematics

1 answer:

slavikrds [6]3 years ago

8 0

Answer:

A: -20

Step-by-step explanation:

first, you have to solve the second equation to get y, and y= -24, then you solve the first

You might be interested in

If sin A = 3/8, find the value of cosec A - sec A.

alexira [117]

Answer:

$\csc A - \sec A = \dfrac 83 + \dfrac{8}{\sqrt{55}}\\\\\csc A - \sec A = \dfrac 83 - \dfrac{8}{\sqrt{55}}$

Step by step explanation:

$\text{Given that,}\\\\~~~~~~\sin A = \dfrac 38 \\\\\implies \sin^2 A = \dfrac 9{64}\\\\\implies 1 - \cos^2 A = \dfrac{9}{64}\\\\\implies \cos ^2 A = 1 - \dfrac 9{64}\\\\\implies \cos^2 A = \dfrac{55}{64}\\\\\implies \cos A =\pm\sqrt{\dfrac{55}{64}}\\ \\\implies \cos A = \pm\dfrac{\sqrt{55}}8\\\\$

$\implies \dfrac 1{\cos A} = \pm\dfrac{8}{\sqrt{55}}$

$\text{Now,}\\\\\csc A - \sec A\\\\=\dfrac{1}{\sin A}- \dfrac{1}{\cos A}\\\\=\dfrac 83 -\left(\pm \dfrac 8{\sqrt {55}} \right)\\ \\\text{Hence,}\\\\\csc A - \sec A = \dfrac 83 + \dfrac{8}{\sqrt{55}}\\\\\csc A - \sec A = \dfrac 83 - \dfrac{8}{\sqrt{55}}$

6 0

2 years ago

Each person in a ticket line gets either one or two tickets. You are the 51st person in line. Forty percent of the people in fro

Marrrta [24]

80 tickets have been given out

50*.4=20
50*.6=30
30*2=60
60+20=80

5 0

3 years ago

A school principal ordered 1,000 pencils.He gave an equal number to each of 7 teachers until he had given out as many as possibl

Ahat [919]

1000/7 = <span>142.857142857

Because this is not an even number we take "142", then times it by 7 teachers.

142*7= 994

1000 - 994 = 6 Pencils left</span>

3 0

3 years ago

Read 2 more answers

What information do you get from a bar graph

Step2247 [10]

Numbers shade ins and lines

7 0

2 years ago

Read 2 more answers

The triangle on the right is a scaled copy of the triangle on the left. Identify the scale

Sveta_85 [38]

Answer: