1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Mamont248 [21]
2 years ago
10

Frankie buys some stamps.

Mathematics
1 answer:
bezimeni [28]2 years ago
4 0

Answer:

22

Step-by-step explanation:

£9.90 = 990p

x is number of 50p stamps

2x* 20 + x* 50 = 990

40x+50x = 990

90x = 990

x = 11

2x = 22

11 50p stamps

22 20p stamps

check:

11*50+22*20 = 550 + 440 = 990

You might be interested in
ILL GIVE EVERYTHING IF U GET IT RIGHTTT<br> pwease&gt;&gt;?
Viktor [21]

Answer:

-4

Step-by-step explanation:

you have to do -11+7

hope this helps dont 4get to like and star

-mercury

3 0
2 years ago
Read 2 more answers
(a) Use the reduction formula to show that integral from 0 to pi/2 of sin(x)^ndx is (n-1)/n * integral from 0 to pi/2 of sin(x)^
Sedbober [7]
Hello,

a)
I= \int\limits^{ \frac{\pi}{2} }_0 {sin^n(x)} \, dx = \int\limits^{ \frac{\pi}{2} }_0 {sin(x)*sin^{n-1}(x)} \, dx \\&#10;&#10;= [-cos(x)*sin^{n-1}(x)]_0^ \frac{\pi}{2}+(n-1)*\int\limits^{ \frac{\pi}{2} }_0 {cos(x)*sin^{n-2}(x)*cos(x)} \, dx \\&#10;&#10;=0 + (n-1)*\int\limits^{ \frac{\pi}{2} }_0 {cos^2(x)*sin^{n-2}(x)} \, dx \\&#10;&#10;= (n-1)*\int\limits^{ \frac{\pi}{2} }_0 {(1-sin^2(x))*sin^{n-2}(x)} \, dx \\&#10;= (n-1)*\int\limits^{ \frac{\pi}{2} }_0 {sin^{n-2}(x)} \, dx - (n-1)*\int\limits^{ \frac{\pi}{2} }_0 {sin^n(x) \, dx\\&#10;&#10;
I(1+n-1)= (n-1)*\int\limits^{ \frac{\pi}{2} }_0 {sin^{n-2}(x)} \, dx \\&#10;I= \dfrac{n-1}{n} *\int\limits^{ \frac{\pi}{2} }_0 {sin^{n-2}(x)} \, dx \\&#10;

b)
\int\limits^{ \frac{\pi}{2} }_0 {sin^{3}(x)} \, dx \\&#10;= \frac{2}{3} \int\limits^{ \frac{\pi}{2} }_0 {sin(x)} \, dx \\&#10;= \dfrac{2}{3}\ [-cos(x)]_0^{\frac{\pi}{2}}=\dfrac{2}{3} \\&#10;&#10;&#10;&#10;&#10;

\int\limits^{ \frac{\pi}{2} }_0 {sin^{5}(x)} \, dx \\&#10;= \dfrac{4}{5}*\dfrac{2}{3} \int\limits^{ \frac{\pi}{2} }_0 {sin(x)} \, dx = \dfrac{8}{15}\\&#10;&#10;&#10;&#10;&#10;&#10;

c)

I_n=  \dfrac{n-1}{n} * I_{n-2} \\&#10;&#10;I_{2n+1}=  \dfrac{2n+1-1}{2n+1} * I_{2n+1-2} \\&#10;= \dfrac{2n}{2n+1} * I_{2n-1} \\&#10;= \dfrac{(2n)*(2n-2)}{(2n+1)(2n-1)} * I_{2n-3} \\&#10;= \dfrac{(2n)*(2n-2)*...*2}{(2n+1)(2n-1)*...*3} * I_{1} \\\\&#10;&#10;I_1=1\\&#10;&#10;




3 0
3 years ago
Help me with this answer please
Leno4ka [110]
I’m not sure but if it’s LCM it’s 60 if it’s GCF it’s 1
6 0
2 years ago
Read 2 more answers
Sophia uses 8 gallons of gas to drive 204 miles at the same rate how many miles can Sophia drive using 18 gallons of gas
Lady bird [3.3K]

Answer:

Sophia can drive 3672 miles using 18 galloons of gas.

Step-by-step explanation:

204 x 18 = 3672.

8 0
2 years ago
Chris borrowed money from her brother. Each week she pays him $5 toward her debt. After 8 weeks, she has $8 left to pay. This si
Alex

C (0,-42) is your answer

7 0
3 years ago
Read 2 more answers
Other questions:
  • ((x+2)+1)^2 hasilnya?
    14·1 answer
  • Statistics from the Riverside Police Department show that in the last 12 years there were 648 reported crimes in the city. Find
    12·1 answer
  • The string that produces the lowest tone on a piano vibrates 87 times in 3 seconds. How many times would this string vibrate in
    6·1 answer
  • Combine like terms 1/4g+7+1/2g-8
    8·1 answer
  • A rectangular prism is 11 3/5 meters long, 9 meters wide, and 12 1/2 meters high. What is the volume, in cubic meters, of the pr
    9·2 answers
  • Help me, answer if you know also pls don’t waste my points
    8·2 answers
  • Given that sin63= 0.891 enter the cosine of a complementary angle
    10·1 answer
  • Is 48/70 closer to 1 or 0
    14·2 answers
  • Please help ill give brainliest
    13·2 answers
  • A: What is the smallest prime number greater than 300?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!