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4 years ago

I have to factorise these...

Mathematics

1 answer:

nydimaria [60]4 years ago

4 0

Answer:

Well the answer to a) is (x - 3)(x + 1) and the answer to b) is (x + 4)(x - 2)

I don't really know how to describe it because I can do factorials in my head like it is nothing.

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There are 112 seats in the school auditorium. There are 7 seats in each row. There are 70 people seated, filling up rows of seat

aalyn [17]

Now, to find how many people are not there, all you have to do is subtract the amount of seats and the people there.
112- 70= 42
Now since there are 7 seats per row and 42 is divisible by 7, you can divide 42 by 7.
42÷7= 6
So, 6 rows were empty.

3 0

3 years ago

Read 2 more answers

Mariana received a bonus of $50 for working the day after thanksgiving ,plus his regular wage of 9.45 an hour .If his total wage

makkiz [27]

135.05 = 50 + 9.45x
85.05 = 9.45x
x = 85.05/9.45
x = 9
Mariana worked for 9 hours.

6 0

3 years ago

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A rectangle has a perimeter of 30 feet and an area of 50 square feet. What are the dimensions of the rectangle?

REY [17]

Perimeter (p) = 2×length (l) + 2×width (w)
p = 2l+2w
area (a) = l×w, so solve for one (I'll use l):
$a = l \times w \\ l = a \div w \\ p = 2l + 2w = 2(l + w)$
since p = 30, and a = 50, substitute the "a÷w" in for l in the perimeter equation:
$p = 2(l + w) = 2((a \div w) + w) \\ = 2((a \div w) + ( {w}^{2} \div w)) \\ p= 2((a + {w}^{2}) \div w$
Now plug in p and a values:
$p= 2((a + {w}^{2}) \div w) \\ 30 = 2((50 + {w}^{2}) \div w) \\ 30 \div 2 = (50 + {w}^{2}) \div w \\ 15w = 50 + {w}^{2}$
$15w = 50 + {w}^{2} \\ {w}^{2} - 15w + 50 = 0 \\ (w - 5)(w - 10) = 0$
therefore width can be either 5 or 10 (but not both), so let's plug in:
l = a÷w = 50÷5 = 10
So if w = 5, then l = 10

D) 5 feet, and 10 feet

3 0

3 years ago

Zach bought two new jet skis for $15,480. He will make 36 equal payments. How much will each payment be?

telo118 [61]

36x = 15480

x = 15480/36

x = 5160/12

x = 2580/6

x = 860/2

x = 430

Zach made equal payments of $430

6 0

3 years ago

What are the values of the coefficients

svet-max [94.6K]

Answer:

a=(-7)

b=1

c=4

Step-by-step explanation:

0=(c)+(a)x²+(b)x

7 0

3 years ago