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lakkis [162]
3 years ago
13

Explain how estimation helps you to place the decimal point when multiplying 3.9 x 5.3 ?

Mathematics
2 answers:
Marina CMI [18]3 years ago
3 0
Well the answer to that is 20.67.
Also, you can simply find this out by placing the decimal as you solve the problem, meaning as when you solve like this
  3.9
x5.3
--------
    .
Drag the decimal down.
Nimfa-mama [501]3 years ago
3 0
If you round 3.9 to 4 and 5.3 to 5 you can easily multiply those numbers together and get 15.
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Triangle abc is a right triangle if side ac=5 and side ab=10 what is the measure of side bc
Nastasia [14]
You use the pythagoream thereom

10squared = 5squared plus xsquared

square root of (100-25)

the root of 75 would be you answer.

Hope this helps!
6 0
3 years ago
Read 2 more answers
F(x)=-3|x-4| Vertical shrink by a factor of 1/2
sweet [91]

to vertically shrink a function by a factor of c, multiply the whole function by c

f(x) vertically shrunk by a factor of c would be cf(x)

so f(x)=-3|x-4| vertically shrunk by a factor of 1/2 would be f(x)=(\frac{-3}{2})|x-4|
6 0
3 years ago
Multiply the fractions together. B Divide 45 5 4 by 13 3 1 . C Multiply the numerators together, and multiply the denominators t
trasher [3.6K]
So we do 5 divide by 4 squeals 10 bye
4 0
3 years ago
the length of a rectangle is 7 yd less than three times the width, and the area of the rectangle is 66 yd(squared). find the dim
Alex_Xolod [135]
So legnt=l
width=w
l=-7+3w
l=3w-7

area=66
area=legnth times width or
area=lw

subisutte
area=lw
l=3w-7
66=(3w-7)(w)
66=3w^2-7w
subtrac 66 from both sides
0=3w^2-7w-66
factor
HOW TO
multiply 3 and -66=-198
find what 2 numbers add up to -7 and multiply to get -198
the numbers area 11 and -18
so
3w^2-18w+11w-66=0
factor
(3w^2-18w)+(11w-66)=0
(3w)(w-6)+(11)(w-6)=0
factor using distributive (ab+ac=a(b+c))

(3w+11)(w-6)=0
set them to zero
3w+11=0
subtract 11
3w=-11
legnths cannot be negative so we discard this

w-6=0
add 6
w=6

width=6
legnth=3w-7
length=3(6)-7
legnt=18-7
legnth=11


width=6
legnth=11

7 0
3 years ago
20a + 158 +6c = 20 (6) + 15 (4) + 6(8)<br> +<br> ?<br> +<br> ?
Jobisdone [24]

Step-by-step explanation:

20a + 158+6c=you will expand the brackets

= so it is 120+60+48

20a+158+6c=120+60+48

20a+ 6c=120+60+48-158

20a+6c=70

20a divide by 20+6c divide by 6 on both side

a + c = 0.58

7 0
2 years ago
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