**Answer:**

a) 100 metres

b) 10 metres

**Step-by-step explanation:**

Given: the approximate height, h, in meters, travelled by golf balls hit with two different clubs over a horizontal distance of d meters is given by the functions:

To find: distances when the ball is at the same height when either of the clubs are used. Also, to find this height

Solution:

(a)

(b)

Put d = 100 in

**Answer:**

The number of nickel coins is 10 and the number of quarter coins is 5

**Step-by-step explanation:**

<u><em>The correct question is</em></u>

Mary has 15 coins with the total value of $1.75 if the coins are nickels and quarters how many of each kind are there

Let

x ----> the number of nickel coins

y ----> the number of quarter coins

Remember that

we know that

Mary has 15 coins

so

-----> equation A

The total value of the coins is $1.75

so

----> equation B

Solve the system by graphing

Remember that the solution is the intersection point both graphs

using a graphing tool

The solution is the point (10,5)

therefore

The number of nickel coins is 10 and the number of quarter coins is 5