3.5 is one side, and 10 is the other. the perimeter is the sum of all sides, so you can add 3.5 and 10 together, then multiply that by two. the answer is 27.

6 0

4 years ago

Read 2 more answers

Dan has $3.75. If he spends 1/3 of his money, how much will he have left?

vovangra [49]

Answer:

b. $2.50

Step-by-step explanation:

1/3*15/4=1.25

3.75-1.25=2.5

6 0

3 years ago

Front end round and do the math -1,244+63,794

liraira [26]

Hello,

Front end rounding is when, instead of rounding each number to a given place value, we round whatever number is in the front.

-1244 + 63794
= 62550

Rounding to Tens Place
= 62550


Faith xoxo

4 0

3 years ago

A metallurgist has an alloy with 10% titanium and an alloy with 20% titanium. He needs 100 grams of an alloy with 17% titaniu

ser-zykov [4K]

$\bf \begin{array}{lccclll}
&amount&concentration&
\begin{array}{llll}
concentration\\
amount
\end{array}\\
&-----&-------&-------\\
\textit{10\% alloy}&x&0.1&0.1x\\
\textit{20\% alloy}&y&0.2&0.2y\\
-----&-----&-------&-------\\
mixture&100&0.17&17
\end{array}$

now, notice, we use the decimal format for the percent, namely 17% is 17/100 or 0.17 and so on

so.... we know, whatever "x" and "y" is, they must add up to 100 grams
thus x + y = 100

and whatever the concentrated amount is, it must add up to 17 grams for the composition

thus 0.1x + 0.2y = 17

$\bf \begin{cases}
x+y=100\implies \boxed{y}=100-x\\
0.1x+0.2y=17\\
----------\\
0.1x+0.2\left( \boxed{100-x} \right)=17
\end{cases}$

solve for "x", to see how much is needed of the 10% alloy

what about "y"? well, y = 100 - x

4 0

3 years ago