**Answer:**

what??????????

**Step-by-step explanation:**

**Answer:**

45 oz

**Step-by-step explanation:**

first you need to find the are of the yard. To do that you multiply the length by the width: 60x90=5400 feet

next you divide by 120: 5400/120=45

therefore, you need to buy 45 ounces of grass seed.

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T**he cat will take 0.8 seconds to catch up with the mouse**

**Step-by-step explanation:**

**Given:**

The distance between the cat and the mouse = 4 feet

cat's speed = 17 feet per second.

mouse's speed = 12 feet per second

**To Find:**

how long will it take the cat to catch up with the mouse = ?

**Solution**:

We know that

distance = speed x time

Rewriting the equation for time we get

time =

now we know that distance is 4 feet

and the speed is 17 -12 = 5 feet per second

Thus the time is

=

= 0.8 seconds

<h2>

**Answer: **a = ¹/₂ (4 + b)</h2>

<h3>

**Step-by-step explanation:**</h3>

To solve for 'a' we have to make it the subject of the equation. Since there are two unknowns ('a' & 'b'), we won't get a numerical value of 'a', but an expression in terms of the second unknown 'b'.

Since 2a - b = 4 <em> [add 'b' to both sides]</em>

then 2a = 4 + b <em>[divide both sides by 2 = multiplying by ¹/₂]</em>

a = ¹/₂ (4 + b)