Ask question

Ask question

All categories

3 years ago

9

I will give 98 points and brainliest for who ever gets these right!! (1.)what is the value of 3+y÷4,when y= 16? (2.) evaluate th

e expression for given values. mx-y when m = 2, x=7, and y = 5?

2 answers:

Rama09 [41]3 years ago

8 0

3 +16÷4=19/4
(2)(7)-5=9

Levart [38]3 years ago

3 0

this equals 3 + 16 / 4

The division is done first so its

3 + 4

= 7 answer

2) mx - y = 2*7 - 5

= 9 answer

You might be interested in

Find the sum of -3x2 -4x+3 and 2x2-x+3

Alika [10]

Answer:

Assuming the 2 at the ends are the exponents,

the answer is -x^2-5x+6 (x^2+5x-6)

from here, it cannot be simplified more

Explanation --

Just add everything by putting the terms in parentheses and adding them.

Keep simplifying by putting the like terms together and adding/subtracting them.

At the end, you come up with -x^2-5x+6, so multiply -1 on the whole thing (by putting parentheses on its sides. This makes x positive. But they are the same thing, but this step is just for simplifying the end product a little more.

Hope this helps!! Have a nice day!

5 0

2 years ago

Casey has a litter of 5 puppies and 3 of them are gray. At this rate, how many puppies would be gray in a litter of 30 puppies?

deff fn [24]

Answer:

18 gray puppies

Step-by-step explanation:

Think of this as finding equivalent fractions/ratios. 3/5 puppies are gray. what over 30 puppies would be gray? to find 3/5=?/30, you multiply the numerator and denominator by 6. 3 times 6 is 18.

6 0

3 years ago

A police helicopter flying at a height of 85 feet shines a light on a speeding vehicle below. If the angle of depression is 62 d

Naily [24]

Answer: 96 feet i believe

8 0

3 years ago

Math expert in polygon angle

soldier1979 [14.2K]

Answer:

50°

Step-by-step explanation:

The internal angles on a quadrilateral sum to 360.

So x+10+2x+x+3x=360

7x+10=360

7x=350

x=50

3 0

3 years ago

The surface area of a melting snowball decreases at a rate of3.8cm2/min. Find the rate at which its diameter decreases when the

Scorpion4ik [409]

Answer:

Step-by-step explanation:

This is a pretty basic related rates problem. I'm going to go through this just like I do in class when I'm teaching it to my students.

We see we have a snowball, which is a sphere. We are talking about the surface area of this sphere which has a formula of

$S=4\pi r^2$

In the problem we are given diameter, not radius. What we know about the relationship between a radius and a diameter is that

d = 2r so

$\frac{d}{2}=r$ Now we can have the equation in terms of diameter instead of radius. Rewriting:

$S=4\pi(\frac{d}{2})^2$ which simplifies to

$S=4\pi(\frac{d^2}{4})$ and a bit more to

$S=\pi d^2$ (the 4's cancel out by division). Now that is a simple equation for which we have to find the derivative with respect to time.

$\frac{dS}{dt}=\pi*2d\frac{dD}{dt}$ Now let's look at the problem and see what we are given as far as information.

The rate at which the surface area changes is -3.8, and we are looking for $\frac{dD}{dt}$ , the rate at which the diameter is changing, when the diameter is 13. Filling in:

$-3.8=\pi(2)(13)\frac{dD}{dt}$ and solving for the rate at which the diameter is changing:

$-\frac{3.8}{26\pi}=\frac{dD}{dt}$ and divide to get

$\frac{dD}{dt}=-.459\frac{cm}{min}$ Obviously, the negative means that the diameter is decreasing.

7 0

3 years ago