All categories

3 years ago

Help me here please if....

Mathematics

1 answer:

Anna35 [415]3 years ago

4 0

You can first use the fundamental trigonometric identity:

sin(x) ^2 + cos(x) ^2 = 1

=> cos(x) ^2 = 1 - sin(x) ^2

=> cos(x) ^2 = 1 - (-4/5)^2 = 1 - 16/25 = (25 - 16) / 25 = 9 /25

=> cos (x) = +/ - √ (9/25) = +/- 3/5

Now, analyze the sign.

In the fhird quadrant the cosine is negative, so the answer is cos(x) = - 3/5.

Answer: option C. - 3/5

You might be interested in

A car travels 294 miles on a full tank of gas. The car's gas tank holds 14 gallons. How many yards per gallon can this car trave

sattari [20]

294 / 14 = 21 miles per gallon
21 * (5280 ft per mile / 3 yards per foot) =
36,960 yards per gallon

4 0

3 years ago

Assume that the probability of a driver getting into an accident 5.3% and the average cost of an accident is $16,806.25 and the

PSYCHO15rus [73]

Answer:

Step-by-step explanation

Uggjyybj

6 0

2 years ago

Read 2 more answers

Given the line -2 + 2y = 5 , find the perpendicular line that goes through (1, -3). HeLP ME PLEASEE QUICK

brilliants [131]

Answer:

x=1

Step-by-step explanation:

Find the negative reciprocal of the slope of the original line and use the point-slope formula y − y 1 = m ( x − x 1 ) to find the line perpendicular to − 2 + 2 y = 5 .

4 0

3 years ago

Two bottled waters and an order of cheese nachos costs $5.50. Three bottled waters and two orders of cheese nachos costs $9.50.

cupoosta [38]

Answer:

1.50 for a water

2.80 for one nacho

Step-by-step explanation:

3w + 2n = 9.5

2w + 1n = 5.5

<em>good luck, i hope this helps :) </em>

<em />

5 0

2 years ago

A company that makes? hair-care products had 7000 people try a new shampoo. Of the 7000 ?people, 42 had a mild allergic reaction

hram777 [196]

Answer: Percent of people who had a mild allergic is 0.6%.

Step-by-step explanation:

Since we have given that

Total number of people try a new shampoo = 7000

Number of people had a mild allergic reaction = 42

We need to find the "Percentage of people had a mild allergic":

Percentage of people had a mild allergic is given by

$\frac{\text{ Total number of people who had a mild allergic}}{\text{ Total number of people}}\times 100\\\\=\frac{42}{7000}\times 100\\\\=\frac{42}{70}\\\\=0.6\%$

Hence, Percent of people who had a mild allergic is 0.6%.

7 0

3 years ago