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2 years ago

I need two answers to 0.75x + 0.8(x + 10) = 101. Please do your best

Mathematics

2 answers:

DanielleElmas [232]2 years ago

7 0

Answer:

Step-by-step explanation:

kirza4 [7]2 years ago

5 0

Answer:

Pretty sure it's x=60

Step-by-step explanation:

0.75x+0.8x+9=101

1.55x+8=101

1.55x=101-8

1.55x=93

and then divide

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3z + 2 + (-52) + 6<br> Help !!!

Norma-Jean [14]

Answer:

3z-44

Step-by-step explanation:

All you have to do is to simplify the numbers. 2 + 6 - 52 = -44.

8 0

2 years ago

5cosx -2sin(x/2) +7=0<br>Help me to find x step by step<br>pls

miskamm [114]

Answer:

x = 180

Step-by-step explanation:

First, you need to know

1. Double-angle formula:

cos(2x) = $cos^{2}x - sin^{2}x$

2. Pythagorean identity:

$cos^{2}x + sin^{2}x = 1$

Back to your problem, replacing the variable by the above:

$5cosx-sin\frac{x}{2}+7 = 0$

$5(cos^{2}\frac{x}{2}-sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Double-angle formula

$5(1 - 2sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Pythagorean identity

Given $y = \frac{x}{2}$

$5(1-2sin^{2}y) - 2siny + 7 = 0$

$10sin^{2}y+2siny-12=0$

$5sin^{2}y+siny-6=0$

$(5siny + 6)(siny - 1)=0$ , we know -1 < sinx < 1, for every x ∈ R

$siny = 1, y =90$

$y = \frac{x}{2}$

$x = 180$

8 0

2 years ago

True or False ?

Gnoma [55]

True the answer is true babes :)

4 0

3 years ago

Solve.

miss Akunina [59]

$4(a+2) = 8 +4a\\
4a+8=8+4a\\
0=0\\ a\in\mathbb{R}\Rightarrow A$

5 0

2 years ago

Read 2 more answers

Using your answer from the previous question, state the value of 't' if Josephine is going to run a dis-

gogolik [260]

Using the relation between velocity, distance and time, it is found that t = 3 hours.

<h3>What is the relation between velocity, distance and time?</h3>

Velocity is <u>distance divided by time</u>, hence:

$v = \frac{d}{t}$

For this problem, the parameters are given as follows:

d = 15 miles, v = 5 mph

Hence the time in hours is found as follows:

$v = \frac{d}{t}$

$5 = \frac{15}{t}$

5t = 15

t = 15/5

t = 3 hours.

More can be learned about the relation between velocity, distance and time at brainly.com/question/24316569

#SPJ1

8 0

1 year ago