MATHEMATICS HIGH SCHOOL

What is the value of x if x + 4y = 7 and x - 4y = 8?

Answers

Answer 1

Answer: x+4y=7
x-4y=8
2x=15
x=7.5

Answer 2

Answer:

Answer:

x====4

Step-by-step explanation:

multiply and divide

Related Questions

PLEASE HELP ME !! PLEASE !!
I need help with this plzzzz
What is larger 3/8 or 5/16
Does anyone know the answer to the question??? 5x+2=7x-4
Consider the quadratic function f (x)= x2-5x+6

1) A circle has a circumference of 121 yd. What is the diameter of the circle? a) 12 yd b) 6 yd c) 18 yd

Answers

Answer:

i think its 6

Step-by-step explanation:

Which is larger 2in or 3,526yd

Answers

Based on the picture, did you mean 2 miles vs. 3,526 yards? If so, here's how to solve it:

1 mile is 1760 yds. So 2 miles is 3520 yards.

Therefore, 3526 is longer than 2 miles.

Elise built a rectangular vegetable garden that is 9 feet long and has an area of 72 square feet. What is the perimeter of Elise’s vegetable garden?

Answers

Well if you know how long it is, you would divide 72 by 9 giving you 8. So the perimeter wold be calculated by 9+9+8+8=34 feet

Perimeter of a rectangle=2(long)+2(width)

1)we calculate the width.
area=long x width

data:
area =72 ft².
long=9 ft

72 ft²=9 ft * width
width=72 ft²/9 ft=8 ft.

2) we calculate the perimeter.
perimeter=2(9 ft)+2(8 ft)=18 ft + 16 ft=34 ft.

Answer: the perimeter of Elise`s vegetable garden is 34 ft.

If you can choose one scoop of ice cream and one topping, how many different sundaes can you make?A. 3
B. 2
C. 5
D. 6
E. 8

Answers

Answer:

Step-by-step explanation:

What is the answer??????

Final answer:

Calculate the total number of sundae combinations by multiplying the number of ice cream scoop choices by the number of topping choices. The specifics are not provided in the question, so the answer varies.

Explanation:

The number of sundae combinations you can make will be determined by the total number of ice cream flavors and the total number of toppings you have to choose from. If we consider each flavor and each topping as a single option, this becomes a problem of counting combinations. The general rule is that if you have 'n' options for one thing (like ice cream scoops) and 'm' options for another thing (like toppings), you multiply them together for the total number of combinations. So far the exact options are not specified in your question, so the correct answer could be any of the options you've provided depending on the specifics of cone and topping choices.

Learn more about Counting Combinations here:

brainly.com/question/31568256

#SPJ2

The vertical height v, in feet, of a snowboarder jumping off of an overhang can be modeled by the function h(t)=15-10t-16t^2, where 15 is the initial height (in feet) of the overhang, -10 is the initial vertical velocity (in feet per second), and t is the time (in seconds). How long does it take the snowboarder to land after jumping off the overhang?"

Answers

Step-by-step explanation:

It is given that, the vertical height v, in feet, of a snowboarder jumping off of an overhang can be modeled by the function as :

$h(t)=15-10t-16t^2$

Where

15 is the initial height of the overhang

-10 is the initial vertical velocity

t is in second

We need to find the time taken by the snowboarder to land after jumping off the overhang. At this condition,

h(t) = 0

So, $15-10t-16t^2=0$

On solving above equation using online calculator, we get the value of t = 0.705 seconds. So, the time taken by the snowboarder to land after jumping off the overhang is 0.705 seconds.

I don't know for sure, but I think there might be an error in the way you copied your function. In all of my dealings with these types of problems, I have learned the formula to be h(t) = 15 + 10t - 16t^2. Notice the plus in front of the "10t". This is due to the fact that if he pushes off of the overhang he would have an upward force of 10 feet per second as soon as his feet left the ground. The only thing pulling him back to Earth is gravity, modeled by the "-16t^2". This is derived from a bit of slightly advanced physics involving the gravitational constant, but let's work under my formula for a second...

Either way, we will wind up using the Quadratic Formula (or possibly factoring if the numbers are easy enough to work with). So let's start.

h(t)= 15 +10t - 16t^2

In order to use the QF or factoring I will need to make h(t)=0. Simply done by:

0= 15 +10t -16t^2

Looking at the numbers, I'd prefer to use the QF so here it is:

$x= \frac{-b + or - \sqrt{b^(2)-4ac } }{2a}$

I know that my answer will need to be positive since you can't have a negative value when dealing with time, so I will eliminate the positive sign from the "+or-" part leaving me with:

$x= \frac{-b -\sqrt{b^(2)-4ac } }{2a}$

And I know that a= -16, b= 10, and c=15. So all that's left to do is substitute and solve.

$x= \frac{-10 -\sqrt{-16^(2)-4*-16*15 } }{2*-16}$

There's a decent amount of math that would be difficult and sloppy for me to do over the computer, but all you need to do is solve the rest of the equation and you would get your answer.

Exact answer: $(5-4 √(15) )/(8)$ or rounded answer: ≈1.31 seconds.

Hope this helps!
NoThisIsPatrick

Which of the following did Columbus NOT bring back with him from his voyages to the "New World"?A Native people
B New foods
C Gold
D New technology for navigation

Answers

A, Native People

Hope this helps ;)

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