can you help me to resolve this

[Gunjan9sahoo]

ERROR: Failed to resolve: com.android.support.appcompat-v7:28.0.0:
Affected Modules: app

below is my gradle file

apply plugin: 'com.android.application'

android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.pa"
minSdkVersion 23
targetSdkVersion 28
// useLibrary 'android.test.runner'
// useLibrary 'android.test.base'
// useLibrary 'android.test.mock'
// buildToolsVersion '28.0.3'
versionCode 1
versionName "3.4.2"
// versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}

}

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support.appcompat-v7:28.0.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
implementation 'androidx.annotation:annotation:1.0.0'
androidTestImplementation 'androidx.test:runner:1.1.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
implementation 'com.google.android.material:material:1.0.0'
implementation 'com.android.support:support-v4:28.0.0'
implementation 'com.google.firebase:firebase-core:17.0.0'
implementation 'com.google.android.material:material:1.1.0-alpha07'
}
apply plugin: 'com.google.gms.google-services'

[AyusPokhriyal-18]

Try this in your Dependencies: compile 'com.android.support.appcompat-v7:28.0.0.+'