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svet-max [94.6K]
2 years ago
13

Work out the answers to:

Mathematics
1 answer:
const2013 [10]2 years ago
3 0

Answer:

A=-4 B=-8 C=8

Step-by-step explanation:

If you need to check these answers multiply the answer by the second number.

A) -4x-3=12  A negative times a negative is always positive.

B)-8x9=-72 A negative times a positive is a negative.

C) 8x-2=-16 A negative times a positive is a negative.

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Unit rates can be helpful with creating a ratio table and plotting the equivalent ratios on a coordinate plane. Explain why. PLE
uysha [10]

Answer:

Unit rate is often a useful means for comparing ratios and their associated rates when measured in different units. The unit rate allows us to compare varying sizes of quantities by examining the number of units of one quantity per one unit of the second quantity. This value of the ratio is the unit rate.

3 0
2 years ago
A rectangular lot is 145 yards long and 100 yards wide.
mr_godi [17]

Answer:

150 by 100

Step-by-step explanation:

5 0
2 years ago
Find the Volume<br> 5 cm<br> 8 cm
padilas [110]

Answer:

it's 13 cm. its no that hard

6 0
2 years ago
Please help me with 20 and 21 pleas
navik [9.2K]

Answer:

.

Step-by-step explanation:

7 0
2 years ago
Area of 320 square feet, the width of the room is 4/5 it's length
jasenka [17]
Area=legnth times width or
a=lw

if w=4/5l
and a=320 then subsitute 320 for a dn 4/5l for w
320=4/5l times l
multiply both sides by 5 to clear fraction
1600=4l times l
ad like terms
1600=4l^2
subtract 1600 from both sides
0=4l^2-1600
try and factor because if you have xy=0 then x and/or y=0 so
difference of 2 perfect squares where
if you have a^2-b^2 then that equals(a-b)(a+b) so
0=(2l)^2-(40)^2=(2l-40)(2l+40)

so 2l-40=0
add 40 to both sides
2l=40
divide by 2
l=20

if
2l+40=0
subtract 40 from both sides
2l=-40
divide 2
l=-20
since meausrements of real objects cannot be negative, wediscard this number


l=20 is thhe true legnth s
subsitute
w=4/5l
w=4/5(20)
w=80/5
w=16

legnth=20
width=16
8 0
3 years ago
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