Can someone please explain this and Answer it

Mathematics

2 answers:

elena-14-01-66 [18.8K]3 years ago

6 0

71
first, subtract 1 from 10 which is 9
then multiply 9 and 7 which gives you 63
now, add 63 and 8
that brings you to your answer, 71 :)

Gwar [14]3 years ago

4 0

Answer:

Step-by-step explanation:

pemdas -> parentheses, exponents, multiplication, division, addition, and subtraction

you have to do those in order

first parentheses so (10-1) = (9)

(you keep the parentheses)

then no exponents so multiplication

7*(9) = 63

lastly addition

8+63

You might be interested in

What must be added to 3x -7 to make x 2 + 4x -1?

Elanso [62]

There is the answer!

6 0

3 years ago

A motorboat takes 3 hours to travel 108 km going upstream. The return trip takes 2 hours going downstream. What is the rate of t

PtichkaEL [24]

Recall your d = rt, distance = rate * time.

let's say the boat has a still water rate of "b", and the current has a a rate of "c", ok.... when the boat is going upstream, is not really going "b" fast, is going slower at "b - c", due to the current going in the opposite direction.

when the boat is coming downstream, is not going "b" fast either, is going faster, is going "b + c", due to the current adding speed to it.

we know the trip up was 108 kms, thus the return trip is also 108 kms.

$\bf \begin{array}{lccclll}
&distance&rate&time\\
&-----&-----&-----\\
Upstream&108&b-c&3\\
Downstream&108&b+c&2
\end{array}
\\\\\\
\begin{cases}
108=3(b-c)\implies \cfrac{108}{3}=b-c\implies 36+c=\boxed{b}\\\\
108=2(b+c)\\
--------------------\\
108=2\left(\boxed{36+c} +c \right)
\end{cases}
\\\\\\
\cfrac{108}{2}=36+2c\implies 54=36-2c\implies \cfrac{54-36}{2}=c$

and surely you know how much that is.

what's the boat's speed? well, 36 + c = b.

8 0

3 years ago

Solve each proportion 3 = 72 – 7

Vanyuwa [196]

1. 504=3x
x=168

2. 64=20m
m=3.2

4 0

2 years ago

What 34 divided by 20196

Komok [63]

Answer:

0.00168350168

4 0