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3 years ago

If Rob Stone had 2 phones and He gave 1 away how many phones he got left

Mathematics

1 answer:

Neporo4naja [7]3 years ago

4 0

Answer:

Step-by-step explanation:

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(Calculus help, 25 points, will give brainliest) Find the sum of the sigma notation below.

Andreyy89

$\displaystyle\sum_{i=3}^{10}(2i-9)=2\sum_{i=3}^{10}i-9\sum_{i=3}^{10}1$

Recall that

$\displaystyle\sum_{i=1}^n1=n$

$\displaystyle\sum_{i=1}^ni=\frac{n(n+1)}2$

Your sums start at $i=3$ , so in order to apply these formulas directly, you need to compensate for the missing first two terms:

$\displaystyle\sum_{i=3}^{10}1=\sum_{i=1}^{10}1-(1+1)=10-2=8$

$\displaystyle\sum_{i=3}^{10}i=\sum_{i=1}^{10}i-(1+2)=\frac{10\cdot11}2-3=52$

$\implies\displaystyle\sum_{i=3}^{10}(2i-9)=2\cdot52-9\cdot8=\boxed{32}$

4 0

3 years ago

1. is a hanger a/an right,acute, or obtuse triangle?

goldfiish [28.3K]

Answer:

1. acute 2. isosceles

Step-by-step explanation:

1. Acute means less then a 90 degree angle a hanger has a degree of about 60.

2. isosceles means it has 2 sides the same length a hanger has 2 sides the same length.

7 0

3 years ago

The radius of a circle is 2.8 cm. Find the circumference to the nearest tenth.

Neporo4naja [7]

Answer: 17.59 cm

Step-by-step explanation: C=2πr=2·π·2.8=17.59292 cm

6 0

3 years ago

Read 2 more answers

Solve each equation for the variable in red #11

Anna11 [10]

I can’t see the picture

6 0

3 years ago

A sauce recipe calls for a cup of chicken broth. To make enough sauce for a party, Marcy needs to triple the

tia_tia [17]

Answer:

She estimates that the tripled recipe will need

✔ less than 3

cups of chicken broth.

The exact amount of chicken broth needed is

✔ 9/4

cups.

Step-by-step explanation:

4 0

3 years ago