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igor_vitrenko [27]
3 years ago
15

Evaluate the expression when a = -3 and c=4. a-3c​

Mathematics
2 answers:
zlopas [31]3 years ago
7 0
-3-3(4)
-3-12=-15

Answer: -15


Hope this helps!
omeli [17]3 years ago
3 0

Answer:

Step-by-step explanation:

c=1/4(A-3c)

4c = A-3c

7c = A

c = A/7

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A person can pay 18$ for a membership at a museum and then go for just 1$ per visit. What is the maximum number of visits a memb
Studentka2010 [4]
<h3>Answer: 32</h3>

==================================================

Work Shown:

Let

x = number of visits

y = total cost in dollars

The membership costs $18 no matter how many visits you do. If you make x visits, at $1 each, then it costs an additional 1*x = 1x = x dollars. This is added on top of the base membership fee. In total, we know that y = 18+x = x+18

We want the total y to be at most $50. Therefore y \le 50. The highest y can get is 50.

Let's replace y with x+18 and isolate x

y \le 50

x+18 \le 50 y is replaced with x+18

x+18-18 \le 50-18 subtract 18 from both sides

x \le 32

This tells us that we can make at most 32 visits. In other words, the maximum number of visits is 32.

6 0
3 years ago
The radius of Earth is about 3960 miles. The radius of the moon is about 1080 miles. a. Find the surface area of Earth and the m
Molodets [167]

A) The formula for surface area of a sphere is A = 4*PI*r^2

using 3.14 for PI:

Surface area for Earth = 4 * 3.14 x 3960^2 = 196,960,896 miles^2

Surface area of the moon: 4 * 3.14 * 1080^2 = 14,649,984 miles^2

B)Divide the Surface of the Earth by the moon:

196,960,896 / 14,649,984 = 13.44

The Earths surface is 13.4 times larger than the moon.

C) Multiply the surface of the Earth by 70%:

196,960,896 * 0.70 = 137,872,627.2 million square miles of water.

4 0
3 years ago
How can I adjust a quotient to solve a division problem
Schach [20]
Ask them to first estimate the quotient and then to find the actual
6 0
3 years ago
Find an equivalent expression to y + 4 + 3 (y + 2) please answer today
vekshin1
My answer would be 2y + 9
8 0
3 years ago
Solve the system with elimination 4x+3y=1 -3x-6y=3
Nuetrik [128]

Answer:

x = 1, y = -1

Step-by-step explanation:

If we have the two equations:

4x+3y=1 and -3x - 6y = 3, we can look at which variable will be easiest to eliminate.

y looks like it might be easy to get rid of, we just have to multiply 4x+3y=1  by 2 and y is gone (as -6y + 6y = 0).

So let's multiply the equation 4x+3y=1  by 2.

2(4x + 3y = 1)\\8x + 6y = 2

Now we can add these equations

8x + 6y = 2\\-3x-6y=3\\

------------------------

5x = 5

Dividing both sides by 5, we get x = 1.

Now we can substitute x into an equation to find y.

4(1) + 3y = 1\\4 + 3y = 1\\3y = -3\\y = -1

Hope this helped!

5 0
3 years ago
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