All categories

3 years ago

Geno started to evaluate 90 – (18+-2)(-3), as shown. What should he do next?

Mathematics

1 answer:

sukhopar [10]3 years ago

3 0

138 is the answer
1. 18+(-2)= 16
2. 16(-3)= -48
3. 90- (-48)= 138

You might be interested in

Pls help me figure this out i would really appreciate it

lubasha [3.4K]

Answer:760ft2

Step-by-step explanation:

Area of first triangle = 1/2bh = 1/2*8*15=60ft2

Area of second triangle = 60ft2

Area of bottom rectangle =20*15=300ft2

Area of top rectangle = 17*20=340 ft2

Total surface area =60+60+300+340

=760ft2

8 0

3 years ago

Find the projection of the vector A = î - 2ġ + k on the vector B = 4 i - 4ſ + 7k. 15. Given the vectors A = 2 i +3 ſ +6k and B =

Gwar [14]

Answer:

Part 1)

Projection of vector A on vector B equals 19 units

Part 2)

Projection of vector B' on vector A' equals 35 units

Step-by-step explanation:

For 2 vectors A and B the projection of A on B is given by the vector dot product of vector A and B

Given

$\overrightarrow{v_{a}}=\widehat{i}-2\widehat{j}+\widehat{k}$

Similarly vector B is written as

$\overrightarrow{v_{b}}=4\widehat{i}-4\widehat{j}+7\widehat{k}$

Thus the vector dot product of the 2 vectors is obtained as

$\overrightarrow{v_{a}}\cdot \overrightarrow{v_{b}}=(\widehat{i}-2\widehat{j}+\widehat{k})\cdot (4\widehat{i}-4\widehat{j}+7\widehat{k})\\\\\overrightarrow{v_{a}}\cdot \overrightarrow{v_{b}}=1\cdot 4+2\cdot 4+1\cdot 7=19$

Part 2)

Given vector A' as

$\overrightarrow{v_{a'}}=2\widehat{i}+3\widehat{j}+6\widehat{k}$

Similarly vector B' is written as

$\overrightarrow{v_{b'}}=\widehat{i}+5\widehat{j}+3\widehat{k}$

Thus the vector dot product of the 2 vectors is obtained as

$\overrightarrow{v_{b'}}\cdot \overrightarrow{v_{a'}}=(\widehat{i}+5\widehat{j}+3\widehat{k})\cdot (2\widehat{i}+3\widehat{j}+6\widehat{k})\\\\\overrightarrow{v_{a'}}\cdot \overrightarrow{v_{b'}}=1\cdot 2+5\cdot 3+3\cdot 6=35$

7 0

4 years ago

8/9 divided by 4/9 what is it?

Trava [24]

Answer:

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Which point represents the largest club that meets in the smallest space?

andriy [413]

Answer:

8 hours

Step-by-step explanation:

Its is on the chart and is at the top

6 0

3 years ago

What is the greatest common factor for 21 and 40?

sdas [7]

To get the Greates Common Factor (GCF) of 21 and 40 we need to factor each value first and then we choose all the copies of factors and multiply them:

21: 3 740: 222 5 GCF: The Greates Common Factor (GCF) is: 1

8 0

3 years ago

Read 2 more answers