All categories

3 years ago

Help please !! Solve -1.6r+5= -7.8

Mathematics

2 answers:

Nikolay [14]3 years ago

5 0

subtract 5 from both sides. -1.6r=-5 divide both sides by-1.6. r=-5/-1.6 simp;ify-5/1.6 to 3.125. r =3.125

jonny [76]3 years ago

3 0

Answer: r=8

Step-by-step explanation: -1.6r+5=-7.8

-16/10r+5=-78/10

-2^4/2.5r+5= -2X3X13/5

-2^3/5r+5= - 3X13/5

(-8r)+25/5=-3X13/5

=8 so r=8

You might be interested in

The population is approximately 280,000 in 2006. The population grows at a rate of 7% per year. What was the population in 1990?

KonstantinChe [14]

Answer:

586,455 people

Step-by-step explanation:

im not sure

5 0

3 years ago

Cos(−θ)=√3/3, sinθ<0

Delicious77 [7]

Answer:

$\sin\theta=-\frac{\sqrt{6}}{3}$

Step-by-step explanation:

The given trigonometric equation is $\cos(-\theta)=\frac{\sqrt{3} }{3}$ .

We can either use the Pythagorean identity or the right angle triangle to solve for $\sin\theta$ .

According to the Pythagorean identity,

$\cos^2\theta+\sin^2\theta=1$

Recall that, the cosine function is an even function, therefore

$\cos(-\theta)=\cos(\theta)$

$\Rightarrow \cos(\theta)=\frac{\sqrt{3} }{3}$ .

We substitute this value in to the above Pythagorean identity to get;

$(\frac{\sqrt{3}}{3})^2+\sin^2\theta=1$

$\Rightarrow \frac{3}{9}+\sin^2\theta=1$

$\Rightarrow \sin^2\theta=1-\frac{3}{9}$

$\Rightarrow \sin^2\theta=\frac{6}{9}$

$\Rightarrow \sin\theta=\pm \sqrt{\frac{6}{9}}$

$\Rightarrow \sin\theta=\pm \frac{\sqrt{6}}{3}$

But we were given that,

$\sin\theta\:$ , so we choose the negative value.

$\Rightarrow \sin\theta=-\frac{\sqrt{6}}{3}$

The correct answer is B

7 0

4 years ago

Joey is 5 years less than three times the age of his son. Joey is 43 years old.

Vikki [24]

Answer:

amogus

Step-by-step explanation:

6 0

3 years ago

An unbiased coin is tossed 20 times find the probability that the coin lands heads exactly 11 times

alexgriva [62]

Both the heads and tails will have a probability of 0.5 with a fair coin. ... TO find probability that foe the 7th toss head appears exactly 4 times.

7 0

4 years ago

What is the stem and leaf plot

jenyasd209 [6]

This is what a Stem and Leaf plot work. Do you know how to use it?

8 0

4 years ago